Emergency Water Guide
Water is the single most important resource in any emergency. You can survive weeks without food but only a few days without clean drinking water. The World Health Organization (WHO) sets a minimum of 1 gallon per person per day for drinking and basic hygiene. FEMA recommends storing enough for at least 72 hours. In scenarios like severe hurricanes or extended infrastructure failure, keeping 7 full days of water on hand is ideal.
In the United States, we have seen how hurricanes, floods, and infrastructure failures can leave communities without safe drinking water for days or weeks. Hurricane Harvey in 2017 contaminated water supplies across the Houston area. Winter Storm Uri in 2021 caused water system failures across Texas. These are not hypothetical scenarios — they happen regularly and affect families who never thought they were at risk.
How Much Water Do You Actually Need
The 1-gallon-per-person-per-day figure from FEMA is a minimum. In practice, your needs depend on several factors:
- Hot climate or physical activity: increases to 1.5–2 gallons per person per day. During a heat wave, dehydration is a real threat.
- Young children and elderly: need special attention. Children dehydrate faster, and elderly people often do not feel thirsty until they are already dehydrated.
- Pets: a medium dog needs about 0.5 gallons per day. Do not forget to include them.
- Cooking and basic hygiene: if you are preparing dried food or rice, you need extra water for cooking.
For a family of 4 over 7 days, the math is: 4 people x 1 gallon x 7 days = at least 28 gallons. That sounds like a lot, but it is just six 5-gallon jugs. If you prefer not to do the math by hand, our emergency planner calculates exact amounts for your situation.
How to Store Water Properly
The simplest approach is commercially bottled water. It is sealed, treated, and lasts 1–2 years. For larger volumes, food-grade water storage containers in 5-gallon or 7-gallon sizes are practical and stackable.
- Store in a cool, dark location away from direct sunlight and chemicals
- Label each container with the fill date
- Rotate tap-filled containers every 6 months
- Keep at least some water in portable containers for evacuation
Water Purification Methods
Even with stored water, you should have a backup purification method in case your supply runs out:
- Water purification tablets: lightweight, inexpensive, and effective against bacteria and viruses. Follow package instructions for dosage.
- Portable water filters: products like the LifeStraw or Sawyer Squeeze remove bacteria and protozoa. Excellent for extended scenarios.
- Boiling: bring water to a rolling boil for at least 1 minute (3 minutes above 6,500 feet). The oldest and most reliable method.
- Household bleach: 8 drops of unscented bleach per gallon, wait 30 minutes. Use only regular unscented bleach (6–8.25% sodium hypochlorite).
Special Considerations
- If you have an infant, store extra water for formula preparation
- Keep a water filter or tablets in your go-bag for evacuation scenarios
- Your hot water heater holds 30–80 gallons of usable water in a pinch
- Never drink floodwater or water from swimming pools without proper treatment
Frequently asked questions
How much water do I need to store for 2 weeks?
FEMA and the American Red Cross recommend 1 gallon per person per day for drinking and basic hygiene. For a family of 4 over 14 days that means 56 gallons, plus roughly 7 gallons for a medium dog. Winter Storm Uri (2021) left Texans without safe tap water for 5–10 days, and Hurricane Helene (2024) knocked out the Asheville system for over 50 days, so the 2-week target is now standard rather than extreme. Practical setup: eight 7-gallon Reliance Aqua-Tainer jugs, or two 30-gallon WaterBricks, plus a Sawyer Squeeze for backup. Store in a cool dark space, label fill dates, and rotate tap-filled containers every 6 months.
What is the best water filter for emergencies?
The four most-recommended options for US households in 2026 are the Sawyer Squeeze (~$40, 0.1 micron hollow-fiber, rated for 100,000 gallons), the LifeStraw Family gravity filter (~$80, 4,755 gallons, no power needed), the Big Berkey countertop system (~$370, 2.25 gallons, removes 200+ contaminants), and the Grayl Geopress (~$100, press-style, removes viruses). Sawyer and LifeStraw remove bacteria and protozoa but not viruses; Berkey and Grayl handle viral pathogens too, which matters after floods like Hurricane Harvey (2017) when sewage entered tap lines. For a single-family home, a Berkey on the counter plus a Sawyer in each go-bag is the most resilient combination.
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How much bleach do I add to a gallon of water to make it safe?
The EPA standard is 8 drops (about 1/8 teaspoon) of unscented household bleach per gallon of clear water, or 16 drops if the water is cloudy. Use plain bleach labeled 5–9% sodium hypochlorite — never scented, color-safe, or splash-less formulas, which contain additives unsafe for drinking. Stir, then let stand 30 minutes; the water should have a faint chlorine smell. If it does not, repeat the dose and wait another 15 minutes. Bleach loses potency 6–12 months after opening, so date the bottle and rotate. During Hurricane Harvey (2017), Houston-area boil-water notices stretched two weeks; bleach treatment is the cheapest backup when fuel for boiling runs out.
Does a Brita filter make water safe in an emergency?
No. Brita, PUR, and similar pitcher filters do not remove bacteria, viruses, or protozoa. Their activated-carbon cartridges improve taste and reduce chlorine, lead, and some heavy metals, but they are not certified to NSF/ANSI P231 or P248 — the standards for microbiological purification. During a boil-water advisory, after a hurricane like Helene (2024), or whenever floodwater enters the system, a Brita is essentially equivalent to drinking the contaminated water. Use one of these instead: a Sawyer Squeeze or LifeStraw (bacteria and protozoa), Aquatabs or Potable Aqua tablets (broad spectrum including viruses), a full rolling boil for 1 minute (3 minutes above 6,500 ft per CDC), or a Grayl Geopress.
What is a boil-water advisory and what should I do?
A boil-water advisory is a public health notice from your local utility, state health department, or the CDC saying tap water may be contaminated and must be treated before use. They are routine after main breaks, hurricanes, and flooding — Jackson, MS spent weeks under one in 2022, and Asheville stayed on advisory for months after Hurricane Helene (2024). Steps: 1) Bring water to a rolling boil for 1 minute (3 minutes above 6,500 ft). 2) Use boiled, bottled, or chemically treated water for drinking, brushing teeth, washing produce, and making ice. 3) Skip showering for infants and anyone with open wounds. 4) Discard ice made before the notice. If you have no fuel, fall back to 8 drops bleach per gallon or Sawyer-grade filtration.
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If you do only one thing, store water first: at least 1 gallon per person per day for a minimum of 72 hours. It is the resource that runs out first and the hardest one to improvise safely. Use our autonomy calculator to estimate how many days your current supplies will cover, or the EmergencyKitLab planner to size the exact amount your household needs.
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