If you are bringing perishable food along with you, it's important to handle your food safely. You certainly don't want to get food poisoning in the middle of nowhere. One of the biggest outdoor food safety issues is with raw meat. If you have raw meat products with you, be sure they are in sealed containers inside the cooler so they won't contaminate other foods. You may find it more prudent to eliminate raw meat altogether. You can bring along pre-cooked hotdogs, for example and just heat them over the fire. Food spoilage is also a problem. Anything with mayonnaise, milk, yogurt or other ingredients that can spoil easily needs to be kept in an ice chest when it isn't being eaten. Fruits are a little bit more durable--they can be kept out for days without a problem.
High energy snacks are always a good idea for camping trips. Traditional outdoor snacks like trail mix, granola, tree nuts, jerky and dried fruits as well as newer treats like health bars will give you the energy you need to keep going. Pretzels, Pop tarts and even chips also have their place as do fresh fruits like peaches, oranges and apples. If you've got kids with you, be sure to bring marshmallows, chocolate bars and graham crackers to make smores with.
If you have a cooler with you on your camping trip, you can prepare nearly any sort of breakfast food. Eggs, breakfast meat, hot cereal and cold cereal and even pancakes are relatively simple to prepare out in the woods. For longer trips, you may want to do away with the eggs and meats, but you can still enjoy the rest of it. If you don't have a cooler, bring powdered milk for your cereal. Wash the breakfast down with coffee, cocoa or tea to warm you up and get you ready for the day ahead.
Sandwiches are convenient campsite food, particularly if you have a cooler available. You can make sandwiches with peanut butter and jelly, cold cuts or anything else you like to eat between two slices of bread. If you don't have refrigeration, you can use canned tuna or canned meats instead. Canned soup and Ramen noodles are quite simple to prepare, and work for both lunch and dinner. Heat your soup up at dinner time, and keep some in a thermos for lunch the next day. If you prefer to make your own soup, bring some bullion cubes, dry bulk food such as lentils or pasta and root vegetables like onions, carrots and beets. It will take you a while to make soup in the woods, but if you don't mind sitting in front of the fire for an evening it is well worth your effort. One of the greatest joys of campsite eating is roasted corn. Put unshucked corn straight on the grill over a flame until it is cooked. Then, rub it with a lemon or a lime, add some salt and enjoy. Remember to bring some sauces and spices to make your food taste better. Tomato sauce, mango chutney, pickled vegetables, salt, sugar and pepper are all useful for preparing dinner. If you'd rather do a BBQ cookout style meal, bring the requisite ketchup, mustard and relish.