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72 hours of supplies would not be nearly enough.

Emergency services get 72 hours grace before they have to feed people. It’s for their benefit in planning responses.

It's not for "Russians launched nukes and we're all going to die" situations.

It's also for "we all got sick and can't manage to go to the store" -> 72 hours of supplies so we don't starve.

It is nothing like being sick. When sick, there is running water at home as usual. Also, one can order food or groceries while sick.