Oats, bullion, beans, rice, dried fruits & veggies, dark chocolate, pasta, quinoa, grits, coffee, jerky, booze!, oils, syrups, canned tuna, anything pickled, popcorn, powdered milk, raw honey, sugar, salt, spices, vinegar...
Just make sure that anything you have is properly sealed. And make sure you have a good water source.
I'm fortunate that I live on a lake so there's always fish and fowl available and we have an artesian well for crystal clear drinking water. If things really go south, you might not be able to rely on freezer meat, but it'll buy you a few days.
Really, the best thing you can stock up on is knowledge. Know where to find things. Know how to hunt and trap. Know how to process meat. Know how to defend. Know your local edible flora. Know first aid. And stock up on books! Books, books, books!
ETA: Tools! Firestarters, knives, saws, shovels, axes, fishing hooks and line, snare cord, scissors, varieties of pliers, needles & thread, mirrors, ropes, chains, fuel, batteries, flashlights.