For a ride of that distance I'd usually start with a bowl of oatmeal and a cup of coffee if its a morning ride. Starting out later in the day, I may eat a peanut butter sandwich or an energy bar to top things off before heading out. If I get hungry during the ride I'll pop a couple fig newtons. As for liquid, I usually carry just water, although longer or hot rides I'll fill one bottle with diluted gatorade.
Your required nutrition level will vary depended on the energy expended. If its a difficult route or you're putting in a lot of effort, then you will deplete your energy stores faster. Just expirement with different foods and find what works the best to keep you going. I'd recommend low fat and low glycemic level carbs as a starting point. The body will have an easier time converting these foods to energy.
Michael