How much water does a family of four need for two weeks?

At the minimum recommendation of one gallon per person per day, a family of four needs 56 gallons for a two-week supply. At the more realistic two gallons per person per day that accounts for cooking, hygiene, and sanitation, the same family needs 112 gallons. With a medium-sized dog added, the total climbs to roughly 120 gallons. Most families find it more practical to plan for the higher amount rather than run short.

How is the daily water need broken down by use?

Per person per day, typical water use breaks down as follows: drinking uses 0.5 to 1 gallon depending on temperature and activity, food preparation uses 0.25 to 0.5 gallons for cooking, rehydrating foods, and washing produce, hygiene uses 0.5 to 1 gallon for hand washing and minimal bathing, and sanitation uses 0.25 to 0.5 gallons for dishwashing and cleanup. Pets need roughly 1 ounce of water per pound of body weight daily. Adding these together explains why two gallons per person per day is a more realistic planning number than one.

How much water should I start with if I'm just beginning?

Start with a three-day supply, expand to one week, then work toward two weeks or more. Practical minimum starting targets are 14 gallons for an individual, 28 gallons for a couple, 56 gallons for a family of four, and 65 to 75 gallons for a family of four with pets. These are starting points — many families choose to store more as space and budget allow. Building gradually is more sustainable than trying to reach a two-week supply all at once.

Should I store more water than I think I need?

Yes. Families who fare best in real emergencies tend to slightly overestimate rather than underestimate their needs. Water is inexpensive to store, and extra water is easy to rotate into daily use for cleaning, gardening, or cooking if it isn't needed for an emergency. After Hurricane Maria in Puerto Rico, families with only stored water eventually ran out during months-long service disruptions. Families with both stored water and purification options proved the most resilient, which is why a complete plan combines both.

How Much Water Should I Store Per Person for an Emergency?

Q: How much water should I store per person for an emergency?

The baseline recommendation from FEMA, the CDC, and the American Red Cross is one gallon per person per day for drinking and basic sanitation. However, this is the survival minimum and does not account for full cooking, hygiene, and household use. Most families need at least two gallons per person per day to be comfortable, and families who have lived through extended emergencies often report using two to three gallons per person daily depending on conditions.

Q: What factors increase emergency water needs?

Several factors increase water needs above the baseline. Hot climates demand significantly more water, especially if air conditioning fails. Physical activity like clearing debris or walking long distances raises needs further. Pregnant and nursing mothers require substantially more water. Certain medications and medical conditions such as diabetes and kidney issues can also increase hydration requirements. Infants require special care — the CDC recommends using commercially bottled water for formula preparation when possible, or stored water that has been properly treated and boiled.

Emergency Water Storage for Families

How Much Water Should I Store Per Person for an Emergency?

The standard recommendation is one gallon per person per day. This comes from FEMA, the American Red Cross, and most emergency management agencies. But one gallon is the bare minimum for survival, not comfort or basic hygiene. It assumes you're only drinking and doing minimal food preparation.

Most families need at least 2 gallons of water per person per day during an emergency. Many families who have lived through extended disruptions report using closer to 2 to 3 gallons per person daily, depending on conditions.

Here's where that water typically goes:

Drinking: 0.5–1 gallon, depending on temperature and activity
Food preparation: 0.25–0.5 gallons for cooking, rehydrating foods, and washing produce
Hygiene: 0.5–1 gallon for hand washing, teeth brushing, and minimal bathing
Sanitation: 0.25–0.5 gallons for dishwashing and cleanup
Pets: roughly 1 ounce per pound of body weight daily

For a family of four with a medium-sized dog, storing water at 2 gallons per person per day plus pet needs means planning for roughly 120 gallons for two weeks.

Factors That Increase Water Needs

Some situations require more water than average.

Hot climates demand more water, especially if air conditioning fails. Phoenix residents use significantly more than those in temperate Seattle. Physical activity like clearing debris or walking long distances will also require additional water.

Pregnant and nursing mothers require substantially more water. Certain medications and medical conditions, including diabetes and kidney issues, can also increase hydration requirements.

Infants require special care. Formula preparation must use clean water. The CDC recommends using commercially bottled water for infants when possible. If using stored water, ensure it has been properly treated and ideally boiled before mixing formula.

How Much Should You Start With?

A simple approach:

Start with a three-day supply
Expand to one week
Then work toward two weeks or more

Practical Starting Targets

Individual: 14 gallons minimum
Couple: 28 gallons minimum
Family of four: 56 gallons minimum
Family of four with pets: 65 to 75 gallons minimum

These are starting points. Many families choose to store more as space and budget allow.

Why Slightly More Is Usually Better

Families who fare best tend to slightly overestimate rather than underestimate their needs. Water is inexpensive to store, and extra water is easy to rotate into daily use for cleaning, gardening, or cooking.

Real-World Lesson

After Hurricane Maria in Puerto Rico, many families went months without reliable water service. Those with stored water were comfortable early on. As weeks stretched into months, families with filtration methods could safely supplement storage using rainwater and natural sources.

Families with only storage eventually ran out. Families with only filters struggled early when conditions were chaotic. Families with both storage and purification options were the most resilient.

Key Takeaway

Plan for at least 2 gallons per person per day, build your supply gradually, and consider both stored water and purification as part of a complete plan.

Related article: How do I purify water during an emergency?

Download Our Complimentary Smart Start Guide to Emergency Water Storage

For a printable reference you can keep with your preparedness supplies, download our free Smart Start Guide to Emergency Water Storage.

Sources and References

These recommendations align with guidance from U.S. public health and emergency management agencies on safe water storage, inspection, rotation, container lifespan, and treatment during emergencies.

Ready.gov — Emergency Water Guidance
Explains why clean water is essential in emergencies and recommends storing at least one gallon per person per day, noting that needs vary with climate, health, and activity.
CDC — How to Create and Store an Emergency Water Supply
Recommends storing at least one gallon per person per day for drinking, cooking, and hygiene and suggests building a two-week supply. Notes that needs increase for pets, hot climates, and people with special health needs.
CDC — How to Make Water Safe in an Emergency
Overview of what to do if tap water is unsafe after a disaster, describing safe options for drinking, cooking, and personal hygiene.
FEMA — Food and Water in an Emergency
Explains why water and food need to be planned for during disasters and discusses planning for days or weeks without reliable services.
American Red Cross — Food and Water in an Emergency
Guidance on storing food and water, estimating needs, and why water is a top priority during emergencies.

Reviewed for accuracy against current CDC, FEMA, and Red Cross guidance.

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