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Emergency Drinking Water in 6 Steps: About 3.8 L per Person per Day

Use CDC guidance to plan a minimum three-day supply and manage storage dates.

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U.S. CDC

Original U.S. CDC guidance link; preview image not verified.

Link card to original U.S. CDC guidance

This is a preparedness guide, not permission to drink unknown or contaminated water during an emergency.

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Count household members and pets; CDC's basic minimum is one gallon (about 3.8 L) per person per day.
Plan at least three days, ideally up to two weeks when practical; allow extra for heat or special needs.
Choose sealed commercially bottled water for the simplest reliable storage option and check its labeled expiry and seal.
If filling your own containers, use food-grade drinking-water containers and follow CDC's full cleaning/sanitizing procedure; never reuse chemical containers.
Store in a cool, shaded area away from fuels and pesticides and write down the storage date.
Review the supply regularly, replace self-filled water every six months and follow local drinking-water advisories in an emergency.