Finding true kosher (certified) meals in any restaurant in the area will be very hard or impossible. If you eat in restaurants he'd probably have to be very selective. It would depend on how strict he is about it. Most of the stores are small convenience stores. I don't think you'd need a stove if you can make a campfire but it might be nice to have one if it rains. There is usually dry wood available. It looked to me like they actually dump dead trees at the campsites on the C&O.