My rock bottom fallback has always been rice with forage for when the cupboard goes bare. Then corn for when the rice gives out, although not being able to get rice around here would be next door to unthinkable. I would be testing for radiation, I mean, if I couldn't get rice here. Rice to fill up on, and forage for nutrients and enough variety that you don't go feeling the edge of your knife and eyeing people who annoy you. Corn is like rice, but not as nutritious and harder to keep the bugs out of, but we can grow corn here a lot easier than we can grow rice. And we can grow sorghum mixed in with the corn for the years when there's no rain at times corn needs rain. Sorghum is like corn, but not as nutritious or as easy to cook with.
Beans and corn make a square meal. I don't like beans and rice. Never have. Give me a mess of black-eyed peas and crusty cornbread, though, and I can dig in happily.
Year one: Rice and forage. Grow corn and beans too, but don't expect to do well enough to eat a lot from this planting because the odds do not favor good production in the first year. Call it practice, and save the seed.
Don't try to grow ten different vegetables in addition to corn and beans unless you've got some experience doing this. The word for that is failure. Spend your year learning how to grow corn and beans and a very, very few precious other things. Whatever people talk about growing like a weed? Plant that. Zucchini? Go for it. If you live in a pie-pumpkin zone, plant that. If you live near me, plant a seminole pumpkin or another moschata instead. And if you don't know what that is, either find out or stick with zucchini. There are long day and short day corns, onions, and beans (at least). Long day means northern while short day means southern. Day-neutral means you can plant it anywhere, supposedly. If you are looking at a catalog for a business located in a very different climate, it might be worthwhile to call customer service and ask if that interesting onion is long day or short day. If they don't know, that's information for you.
Year two: Grow corn and beans from your saved seed, which is selected for your particular conditions. Grow whatever grew best of the other vegetables. Add one or two other vegetables. And forage too. Especially watch for nuts, insects and larvae, and fish. If you have not found a way to put eggs on the table, keep trying to find a way.
Year three: Repeat year two.