Here are the things which I was eating during the trip.
Mostly I used fast food restaurants or the gas stations next to the road, they are offering quite good chicken salads and so on. I really liked chicken wings on the 7 Eleven gas station, but that was in east part of the country. Water, fruits very often I was buying at supermarkets Dollar General or a Walmart, they are everywhere. My favorite was a Dollar general, small markets like a german LIDL or ALDI in europe.