Costco has 50 pound bags of rice or bread flour for $17. Hat alone will keep an adult male going for a month. (Yes, nutrition is lacking but it will get you the calories needed to get nutrition.)
I think of that as Stalingrad level food store, where they were peeling the wall paper off to eat the flour paste glue.
Having plenty of rice and beans and flour gives you food, and I would rather be having to scrounge for plants and insects and rabbits, to keep me alive, than to have the weeds and grass and occasional rabbits, but no bulk foods.