Rice, beans, ramen, potatoes, etc. There are many inexpensive foods that can keep you alive. But you have to buy in bulk, i.e. 50 pound bags. I think you would

Rice, beans, ramen, potatoes, etc. There are many inexpensive foods that can keep you alive. But you have to buy in bulk, i.e. 50 pound bags. I think you would also want supplements, vitamins, etc. Plus I think that while your body can theoretically make all the protein it needs from rice and beans, I think you'd also need to have fresh fruits and vegetables in your diet. I certainly wouldn't want to risk it without those. And unless you grew your own, they would probably cost more than the rice and beans. But you shouldn't need to buy meat, which is comparatively very expensive.