How long can chickens go without food?

[farmert]

I'm concerned about the winter storm forecast for central NC. My coops are about 100' from the house, and if I am snowed/iced in, I cannot get to them. I give them feed before they go to roost, but I worry about them being cooped up and without food for a long period of time. They aren't overcrowded -- rooster with three hens in one coop with two rooms; two hens (newbies) in a separate, large coop.

 

[nuthatched]

How big is the feeder? You can dump feed in a big bowl or on the ground if needed.
Water is a bit more pressing