Best thing to do is stop in a town when you're hungry - look for a tourist info building, or a gas station that appears to also serve as a local hangout or even just start questioning people on the street for the best places to eat. The locals always know best and I've never been steered wrong. Make sure you let them know that you are not afraid of getting sick. Sometimes local cuisine can be spicy and people will be wary of telling you about it. I know I always ask people if they can handle spices and/or grease when telling them about good restaurants around here.