11
Three days of drinking water
CDC guidance is at least one gallon per person per day for drinking and sanitation combined. Three days is the floor. Store more for pregnancy, illness, pets, and hot climates.
Why here. Water is the shortest clock in any disruption and the cheapest thing on this list to fix.
“One gallon per person per day is a survival ration, not a real number.”
Fair, and worth naming plainly. One gallon is a floor set for drinking and minimal hygiene. It assumes no showers, no laundry, and careful dishwashing. If you want to be comfortable rather than adequate, plan for two. We use the published floor because it is verifiable and because a household that hits the floor is far ahead of one that never started. Never ration drinking water on your own initiative. Ready.gov is explicit that you drink what you need unless authorities instruct otherwise.
“Bottled water goes bad.”
Commercially bottled water carries an expiration date you should observe, which is largely about the plastic rather than the water. Water you bottle yourself should be replaced every six months. Both are addressed at item 98.