Ride nutritioin for me tends to turn into "things to look for at controls." The country store after a couple hours is easy --OJ, maybe a fried cherry or an oatmeal pie. Mid- to late afternoon is harder; go for protein (Subway steak sandwich) or a large order of fries?

Best tip I ever got was a bowl of chicken noodle soup. It was loaded with enough salt to replenish me after a hot day's ride, and made me thirsty enough to chug a couple bottles of fluid.