If you have land it wouldn't hurt to have some survival crops. Something like sunchokes (a.k.a. jerusalem artichokes, bad name because they're not an artichoke and more like a sunflower) can grow well in a sectioned off space where they can't spread. In an emergency the tubers can be dug up and cooked, though they'll probably give you a lot of gas from the high inulin content.
Personally I love raspberries and black raspberries, which are easy to grow just don't plant them where they can spread and run wild. It's nice to have fresh berries!