Take a half-dozen energy bars of your choice, mainly as emergency food in case you find no other food that day (e.g., everything is closed or out of business when you arrive at your destination for the day). You're really hoping never to use these energy bars.
If you expect to have access to food at the beginning and end of each day, then all you need to take is lunch and snacks. Possibilities are fruit, raisins, cookies, carrots, cheese (the harder the cheese, the longer it will last), prepackaged sandwiches (my usual), chocolate milk (if you buy it in the morning, it will keep until lunch). If water is unsure, take along plenty of fluids. Possibilities here are extra water bottles, water bladders, and bottles of sports drinks.
It's not really that hard. I took a tour recently where for several days in a row there wasn't even so much as a building in 80 miles for several days on end (but there was food at the beginning and end of each day).