The first thing that comes to mind is matches and/or lighter fluid. There are a number of different kinds of fire starting material on the market today from charcoal bricketts, to a paste. It is always a good idea to take some plain old newspaper along, those cardboard egg holders you get at the store can be a great help in getting your fire startetd. Then you will need a medium to large, light weight, post, a pan of similar size, aluminum foil and a portable grate to set over the fire. With just this small amount of cooking equipment, you can cook almost anything, breakfast to supper. Don't forget a spatula and tongs, taking food from the fire can be hazardous to say the least.
The direct heat of the campfire to cook a meal is the basic method of cooking. Cooking food that requires high heat can be wrapped in foil and set in the hot coals, this will require that you check it frequently.
Another way to use heat from your campfire, is to put a grate over the fire and cook your food as if you were having a BBQ in your yard back home. The heat is less direct and likely to take longer to cook the meal.
Using the pots and pans, mentioned earlier, you can cook soup, stew, and even pasta. These require you build a good fire, let it die down to coals and place the pan or pot over them. The hard part is managing the coals as the heat can become inconsistent fairly fast.
With practice, camp cooking is almost as easy as cooking in your kitchen at home
