💧 Water & Sanitation

The Principle: A typical British home contains more water than most people realise. Knowing where it is and how much you have buys time before rationing becomes critical.

What You Need to Know:

• The stopcock (internal stop valve) is the control point for mains water in your home. It is almost always located under the kitchen sink or in a cupboard nearby—sometimes in the hall, airing cupboard, or under floorboards near the front door. Turning it clockwise cuts off incoming water; turning anti-clockwise restores it. Your house will still drain what's already in the system.
• A typical British home contains roughly 400–600 litres of accessible water: cold water tank in the loft (usually 100–150 litres), hot water cylinder (100–200 litres), two toilet cisterns (18–20 litres each), plus smaller amounts in pipes, kettles, and other containers.
• Daily water requirements per person are approximately: 1–1.5 litres drinking, 1–2 litres cooking, 5–10 litres basic washing (hands, face, minimal bathing), and 6 litres toilet flushing. Total survival minimum: roughly 13–20 litres per day for one person. Standard emergency guidance suggests 50 litres per person per day including laundry and cleaning, but bare survival requires far less.
• Water hierarchy in order of priority: drinking → cooking → sanitation (toilet flushing) → basic personal hygiene → washing clothes → general cleaning.
• Bottled water in the home, ice in the freezer, and water from hot taps (the hot cylinder) all contribute to reserves. Rainwater collection via gutters and drains is feasible but requires planning.

The Simple Process:

1. Locate and label your stopcock (practise finding it before crisis hits).
2. When water cuts, close the stopcock immediately to prevent your stored reserves from draining.
3. Drain the cold water tank by opening the highest tap in your home (typically a loft or upstairs bathroom cold tap). The water will run until the tank empties.
4. Drain the hot water cylinder through the drain cock at its base (usually in an airing cupboard or under the stairs). Have a bucket ready—this water is hot.
5. Use stored water in the priority order above: drinking, then cooking, then toilet flushing.

Common Mistakes:

• Leaving the stopcock open after mains failure, allowing your stored water to drain into the street and wasting your emergency reserves.
• Assuming water from the hot cylinder is not drinkable—it is perfectly safe once cooled, provided the cylinder itself is clean.
• Flushing toilets unnecessarily. Each flush uses 6–10 litres. Use the bucket-flush method (see card S19) to extend reserves.
• Panic-drinking from the loft tank without boiling first, assuming it is sterile. Loft tanks are exposed to the atmosphere and dust; boil before drinking.

Improvisation:

• Drinking water: Collect rainwater from clean gutters into buckets or butt. If none is available and mains has failed, use water from the loft tank (boil first), hot cylinder, or kettle/hot water bottles.
• Washing with minimal water: Use a basin (a mixing bowl or sink basin) filled with 2–3 litres of water for handwashing or face washing. Dampen hands, add soap, wash, then rinse with a jug. Children and adults can both wash adequately with this volume.
• Toilet alternatives: If water is severely rationed, use a chemical toilet, composting toilet, or prepared bucket toilet (see S19) rather than flushing.

Historical Note:

In the early 1900s, the majority of British households had neither running water nor indoor toilets. Water came from public wells, water carriers, or the street pump. The "great stink" of London in summer 1858—raw sewage in the Thames—forced the government to build modern sewer networks, but indoor plumbing only became standard by the 1890s–1920s. A great-grandparent would have been familiar with bucket toilets, basin washing, and collecting water in pitchers. They would understand rationing instinctively; they lived it daily.

Safety:

• Never drink untreated water from a loft tank or unknown source—loft tanks can contain dead insects, sediment, and bacteria. Always boil first.
• Drain the hot cylinder carefully—the water is scalding. Ensure the heating is off and wait for it to cool slightly before collecting.
• Do not mix human waste with drinking water sources. Maintain strict separation between toilet areas and water collection/storage.

The Principle: Excess heat is dangerous because the body cannot cool itself. The distinction between heat exhaustion (manageable) and heat stroke (life-threatening) is critical: one causes confusion; the other does not.

What You Need to Know:

• Heat exhaustion is the body's early warning. Symptoms: heavy sweating, cool or clammy skin, high body temperature (above 38°C), dizziness, nausea, muscle cramps, headache, rapid pulse. The person remains alert and their thinking is clear. Heat exhaustion is uncomfortable but not immediately life-threatening if treated within 30 minutes.
• Heat stroke is a medical emergency. Symptoms: confusion, disorientation, aggression, slurred speech, lack of sweating (or profuse sweating), hot and flushed (or hot and dry) skin, body temperature above 40°C, rapid strong pulse, seizures, or loss of consciousness. Heat stroke indicates the brain is failing. Without cooling within 30 minutes, serious organ damage or death can occur.
• Vulnerable populations at risk: elderly people, infants, pregnant women, people with existing cardiovascular or respiratory disease, and those on medication affecting temperature regulation or hydration.
• Hydration is essential but not a complete defence—drinking water slows heat illness but cannot prevent it if core temperature is rising and the environment is too hot.
• Night cooling is crucial: the body temperature drops at night. Sleep in the coolest room available, and allow air to flow freely around sleeping areas.

The Simple Process:

1. If heat exhaustion is suspected: move the person to a cool place immediately (shade, basement, or air-conditioned space). Lie them down with feet elevated. Give them water to drink. Cool the skin: sponge with water, or wrap in damp cloths. Fan them continuously. Monitor for 30 minutes. If they improve and remain alert, they can usually recover at home.
2. If heat stroke is suspected: call emergency services immediately (999). Do not delay. While waiting: move to a cool place, remove excess clothing, cool the skin aggressively (ice packs to groin, armpits, and neck if available; sponging with water; fanning). If the person is conscious, give small sips of water. If unconscious, position on their side (recovery position) to keep the airway open.
3. To prevent heat illness: stay in the coolest available space during peak heat (typically 11am–4pm). Drink regularly even if not thirsty. Avoid alcohol and caffeine. Limit physical exertion in heat.

Common Mistakes:

• Confusing heat exhaustion with heat stroke and failing to seek emergency help when the person is confused. Confusion = heat stroke = call 999.
• Assuming the person is fine because they are sweating. Heat stroke can cause lack of sweating or profuse sweating; sweating alone is not reassuring.
• Giving fluids to an unconscious person—risk of choking. If unconscious, position in recovery position and wait for emergency services.
• Trying to cool someone too rapidly or aggressively—this can cause shock. Cool gradually and monitor their condition.

Improvisation:

• Keep a room cool without electricity: open windows at night to draw in cool air; close windows and blinds during the day to block heat. Use fans (hand fans or table fans if electricity is available) to move air across the skin—this creates an evaporative cooling effect. Wet sheets or damp towels placed over windows can help. Sleep in the lowest, most sheltered room in the house (cellars or basements stay cooler).
• Hydration without refrigeration: water at room temperature is still drinkable and hydrating. Store in cool, dark places. Boil water in early morning when cooler, then let it cool naturally.
• Temporary cooling: place a bowl of ice (if any remains in a freezer) in front of a fan to create a makeshift air cooler. Or use damp cloths on pulse points (wrists, neck, groin) where blood vessels are near the skin.

Historical Note:

Early 1900s Britain rarely experienced the sustained heat that now triggers heatwave alerts. Homes were designed for cold climates: thick stone walls, small windows, dark interiors. Deaths from heat were rare and largely attributed to the poor in overcrowded urban slums. A great-grandparent would have slowed down, worn lighter clothing, and worked in the cool of early morning and evening. They lacked modern understanding of heat stroke but intuitively understood the danger of "sunstroke" and would seek shade, drink continuously, and rest during peak heat.

Safety:

• Heat stroke is a medical emergency. Do not attempt home treatment. Call 999 immediately if the person is confused, unconscious, or has a very high temperature (above 40°C).
• Infants and the elderly are at extreme risk—they cannot regulate temperature effectively. Monitor them closely and cool them at the first sign of distress.
• Dehydration and heat illness are cumulative—repeated heat exposure over days increases risk. Stay hydrated continuously, not just when thirsty.

The Principle: Three methods exist: boiling (kills everything except spores and is foolproof), chemical treatment (cheap, portable, but leaves a taste), and solar disinfection (free, slow, requires clear bottles and sun). Improvised filtration (sand/gravel/charcoal) clarifies murky water but does not sterilise it—use filtration before, not instead of, boiling or chemical treatment.

What You Need to Know:

• Boiling is the gold standard. A rolling boil for one minute kills bacteria, viruses, and protozoa. At altitudes above 5,000 feet, extend to three minutes. The rolling boil itself is the key; temperature matters more than duration. Once the water is at a rolling boil, the pathogens are dead within seconds; the one-minute guideline provides a safety margin and a clear visual endpoint. Boiling does not remove sediment, chemicals, or heavy metals—filter first if the water is visibly cloudy.
• Household bleach (unscented, 5–8.25% sodium hypochlorite) is effective and portable. Use 2 drops per litre of clear water, or 4 drops per litre if the water is cloudy. Stir and wait 30 minutes before drinking. The water should smell faintly of chlorine; if not, repeat the dose and wait another 15–30 minutes. Bleach disinfects but does not filter sediment; it also leaves a chlorine taste.
• Solar disinfection (SODIS) exploits UV light and heat. Fill clear 2-litre PET plastic bottles (clear drinks bottles, not green or brown glass) with the clearest water available. Expose to direct sunlight for 6 hours on a clear day, or 48 hours (two days) on a cloudy day. If water temperature exceeds 50°C (detectable by touch—too hot to hold), reduce exposure to 1 hour. SODIS is slow but requires only sun and bottles. It works best on pre-filtered or clear water; turbid water blocks UV penetration.
• Improvised filtration (sand, gravel, charcoal) removes visible sediment and improves taste/smell but does NOT kill pathogens. Use it to clarify water before boiling or chemical treatment, not as a substitute for either.

The Simple Process:

For boiling:

1. Fill a pot or kettle with water.
2. Heat on a stove, fire, or other heat source until it reaches a rolling boil (bubbles break the surface vigorously).
3. Maintain the rolling boil for one minute (or three minutes at high altitude).
4. Remove from heat and allow to cool. Store in a clean, covered container.
5. Boiled water should be used within 24 hours if stored in a cool place; discard if it has been sitting for more than a few days or shows any discolouration.

For bleach treatment:

1. Pour the water into a clean container.
2. Add 2 drops of unscented household bleach per litre (4 drops if water is cloudy).
3. Stir thoroughly.
4. Wait 30 minutes without drinking.
5. Check the smell—there should be a faint chlorine odour. If not, repeat the dose and wait another 15 minutes.
6. The water is now safe to drink, though it will taste of chlorine.

For SODIS:

1. Use the clearest water available (pre-filter if needed).
2. Fill clear, transparent 2-litre plastic bottles to the brim (UV needs to reach all the water).
3. Lay bottles horizontally in full, direct sunlight.
4. Mark the start time. Leave for 6 hours (sunny day) or 48 hours (cloudy day).
5. The water is now safe to drink. Store in a cool, dark place to prevent regrowth.

For improvised sand/charcoal filtration:

1. Layer materials from top to bottom in a container (pot, bucket, or cloth): coarse gravel (2 cm), sand (10 cm), fine sand or charcoal bits (5 cm).
2. Pour cloudy water slowly through the top.
3. Collect the clearer water from the bottom.
4. This water is still not safe to drink without boiling or chemical treatment.

Common Mistakes:

• Assuming filtration alone makes water safe. Sand and charcoal remove particles and improve clarity, but they do not kill bacteria or viruses. Always boil or chemically treat afterwards.
• Using scented or colour-safe bleach—these contain additives that are unsafe for drinking water. Only use regular, unscented household bleach.
• Adding too much bleach. Over-treatment makes the water undrinkable and can cause stomach upset. 2 drops per litre is correct; do not exceed 4 drops per litre even for very cloudy water.
• Trying to SODIS cloudy water—turbidity blocks UV from reaching all pathogens. Pre-filter to clarify first.
• Leaving boiled water uncovered—it can be recontaminated by dust, insects, or touch. Always cover stored drinking water.

Improvisation:

• If you have no bleach or boiling fuel, use SODIS: it requires only sun and clear bottles. In an emergency, drink bottles can be repurposed.
• If you have no clear bottles, boil instead: SODIS cannot work with opaque or brown bottles because UV cannot penetrate. Boiling is reliable even without sunlight.
• If you have no fuel for boiling, use bleach or improvise a solar still: a solar still is a shallow pit or covered bucket that catches condensation from damp soil, but it is very slow (produces litres over hours). Bleach is faster and more reliable if available.
• To improve the taste of chlorinated water, let it stand uncovered for a few hours—chlorine will partially evaporate. Or add a pinch of salt or lemon juice (if available) to mask the taste.

Historical Note:

Before modern piped water (c.1900), people in Britain drank whatever was available—well water, river water, or rainwater collected in barrels. They understood boiling intuitively: water for tea was always boiled. They were less aware of why boiling worked; germ theory was still new. In the 1858 "Great Stink" of London, contaminated Thames water killed thousands from cholera before anyone understood that water (not miasma or bad air) was the culprit. By the 1900s, boiling and storing water in sealed containers became standard practice among those who could afford it. The poor continued to drink contaminated water and suffered the consequences.

Safety:

• Boiling is always safe if done properly. It leaves no chemical residue and works on any water.
• Bleach is safe in the specified doses but poisonous in excess. Never exceed 4 drops per litre. Never drink bleach directly.
• SODIS works best with pre-filtered, clear water. Turbid water may not be fully disinfected. If in doubt, combine SODIS with boiling.
• Improvised filters must always be followed by boiling or chemical treatment—do not rely on filtration alone, no matter how fine the sand or charcoal.

The Principle: Human waste is the primary vector for disease. Sanitation (keeping waste away from water and food) is more important than comfort, and can be maintained with minimal water. Handwashing is the single most effective way to prevent disease transmission.

What You Need to Know:

• The bucket flush method is the simplest emergency toilet strategy. Pour 2–3 litres of water directly into the toilet bowl (not the cistern) with force. The water pressure will carry waste down the pipe. Most modern toilets require only 1.5 litres; older toilets may need more. The bowl will refill and function normally if mains water returns, but without mains, the cistern is useless.
• Foul drains (main drainage) and surface water drains are often separate underground. Foul drains carry sewage from toilets and sinks; surface water drains carry rainwater from gutters and yards. If one is blocked, the other may still work. Know which drain feeds your toilet—usually marked with a "D" cover in the garden or yard. Never pour human waste into surface water drains.
• Handwashing with minimal water is extraordinarily effective at preventing disease. Handwashing with soap reduces diarrheal illness by 30–50% and respiratory infection by 15–20%. As little as 0.5 litres of water is sufficient for handwashing if applied correctly: dampen hands, add soap, wash thoroughly for 20 seconds (between fingers, under nails, backs of hands), then rinse with small amounts of water. The soap and friction are what matters, not volume.
• Sanitation without plumbing becomes necessary if water is completely unavailable. An emergency latrine is a simple pit dug at least 30 metres from any water source (well, stream, or groundwater). Cover waste with soil or ash after each use. This prevents direct contamination of water sources.
• Separation of waste is crucial: urine and faeces are separate hazards. Urine alone is not immediately dangerous; faeces contain the pathogens that cause diarrhoea, cholera, typhoid, and dysentery. If water is so scarce that toilets cannot flush, a separated-waste system (collecting urine separately, mixing faeces with sawdust or ash) extends sanitation without needing to dig pits.

The Simple Process:

Bucket-flush toilet:

1. Fill a bucket with 2–3 litres of water.
2. Stand back and pour it directly and forcefully into the toilet bowl (not the cistern).
3. The water will force waste down the drain.
4. Repeat for each use. The bowl self-refills from residual water; it will not be as clean as with mains water, but it functions.
5. If water is very scarce, use 1.5 litres (the minimum), but ensure a full flush; a half-empty pour may not clear the bowl.

Handwashing with minimal water:

1. Pour approximately 500 ml (half a litre) into a basin or bowl.
2. Dampen hands in the water.
3. Add a small amount of soap (a fingertip-sized amount).
4. Wash hands thoroughly: between fingers, under nails, backs of hands, and wrists. Take 20 seconds.
5. Pour a small amount of water to rinse (roughly 200 ml).
6. Shake dry or use a cloth.
7. The remaining water can be used for a second person or tipped away.

Emergency latrine (if plumbing fails completely):

1. Choose a location at least 30 metres downhill and away from any water source—well, stream, pond, or groundwater.
2. Dig a pit 1–2 metres deep and approximately 30 cm in diameter.
3. Position a seat over the pit (a simple wooden board with a hole, or a bucket with a seat lid).
4. After each use, cover faeces with a handful of soil, ash, or sawdust. This prevents smell and keeps flies away.
5. When the pit is nearly full, cover it completely and dig a new latrine nearby.
6. If digging is not possible, use a bucket toilet: a bucket with a snap-on seat lid, emptied and buried regularly away from water sources.

Common Mistakes:

• Using mains water frantically for toilet flushing after a shutdown. A single toilet flush uses 6–10 litres. Use the bucket-flush method to stretch reserves.
• Pouring water into the cistern instead of the bowl. The cistern is a storage tank, not a flush mechanism. Water must enter the bowl with force to work.
• Allowing human waste to enter surface water drains or groundwater. This contaminates drinking water sources for miles downwind and spreads cholera, typhoid, and other deadly diseases.
• Handwashing inadequately because water is scarce. 20 seconds of thorough handwashing with soap is non-negotiable. Rushing or using less soap reduces effectiveness dramatically.
• Failing to cover a latrine or pit. Uncovered human waste attracts flies, which transmit disease to food and water. Always cover waste immediately.

Improvisation:

• Toilet seat for a pit latrine: a simple wooden board with a hole sawn through it, or an old bicycle seat frame over the pit, works as well as a manufactured toilet seat. In a pinch, squat over the pit.
• Minimal-water basin wash: use a cup or mug to pour water rather than a basin—it uses less and is portable. One cup (250 ml) is often enough for face and hands if poured carefully.
• Soap substitutes: ash from a fire, combined with a small amount of water, creates a lye solution that acts as a basic soap. Soap nuts, if available, work similarly. If no soap is available, friction and water alone still remove some pathogens—not ideal, but better than nothing.
• Odour control in a latrine: sprinkle ash, soil, or plant material (pine needles, straw) into the pit after each use. This also reduces flies and speeds decomposition.

Historical Note:

Before indoor plumbing (pre-1900s), British households used outdoor privies (sheds housing a wooden seat over a pit) or chamber pots emptied into the yard or street. Night soil collectors were paid to cart waste away. Urban slums had communal privies serving multiple families, breeding grounds for cholera and typhoid. Open defecation in streets was common among the poor. Handwashing was rare; a wash basin and jug in the bedroom was luxury. Disease was rampant: cholera epidemics killed thousands; infant mortality from diarrhoea was catastrophic. A great-grandparent would have seen family members die from sewage-related illness. They would understand instinctively that separation of waste from living areas was survival, not comfort, and that any water for washing was precious.

Safety:

• Human faeces are hazardous. Do not touch bare-handed. Always wear gloves if contact is likely, and wash hands thoroughly afterwards.
• Never drink water from a source near a latrine or septic system. Contamination can persist even if the water looks clear.
• Keep latrines at least 30 metres from any water source. Groundwater can travel; downstream is not far enough.
• Handwashing before eating is non-negotiable, even if only a small amount of water is available. Disease transmission from contaminated hands to food is direct and rapid.
• Encourage handwashing especially after defecation and before food preparation. These are the two critical moments where faecal contamination transfers to food and causes outbreaks.