In the state I live in, there are a plethora of $1 stores that sell all types of fruits, vegetables, cheap meats, and pre-packaged food for $1. They even sell Breyers half gallon vanilla icecream for $1. The local big grocery store sells mass quantities of bananas(20) for 99cents. I have seen 3lb potatoes going for $1 as well. You could easily live off a dollar a day. It might not be the healthiest thing to do, but it's completely doable.