Meal Ready to Eat. It's a packaged thing that cooks itself in the bag when you break the heating element.

They taste like garbage, but they last forever so people stockpile them. Where I'm from there's a whole lot of preppers who think the world is gonna end. Which.. I guess they were right about. But they kept hundreds of those things around to eat during the apocalypse while they locked themselves in their bunkers.

I dunno that I'd call that living though.