I don't have much stocked up. I have the guns and ammo to hunt the overgrown deer population around here for years, and I live close enough to water that I can get water for a while, too.
One thing to consider with MREs it that the caloric density is not as high as some other long-shelf-life foods, so if you have to get up and go, they'll take up more space than alternatives.
"Two one-megaton atomic bombs explode over New York City" from The Nuclear Winter by Carl Sagan, right?