I usually take sandwitches on longer rides. Not something to eat whilst riding, but they do the job. Bananas are a good standby (ripen to alter their sugar content), and if its cold and wet, bananas and chocholate are a good boost.
Water consumption really depends on the conditions. For temperate UK, where you are usually covered up against a cool breeze, you dont need as much as a hot dry day. I find that a large waterbottle lasts for a morning, but I chugg down a lot before I ride.