OK - FEMA (spit), The Red Cross, Southern Baptists (who run a large percentage of the disaster kitchens), etc all say "you are totally on your own for at least 72 hours"

They Will probably get you food/water after 72 hours. It's probably NOT going to be hot water, or warm food. Don't expect a shower.

You don't need HOT food, and a hot shower to live. What shows up after 3 days is "Here is enough to keep you alive for another couple of days while we get back to you"

Think of it like a military operation. The folks you see at 72 hours are the "scouts" - they are light, move fast, and can do the very minimum - the main body of the forces comes slower, and later