There's no car camping without food, unless you're planning on fishing for all of your food. Even if you're planning on doing that, though, are you really going camping without drinks? Probably not. So, you may as well plan on bringing other foods, too, and learning how to pack them properly for the trip.
You need a dry box to hold all of your non-perishable, dry items. This can be anything from pasta to flour to whatever else you may want to bring with you to cook with. Some classic snack foods for car camping are chips, marshmallows, and trail mix. But, feel free to pack whatever dry foods you want.
Next, you'll need somewhere to keep cold foods, such as dairy, cheese, hot dogs, and other types of meat so they don't spoil. A traditional cooler with ice in it is what most people do, but you always end up having to drive back into town to get more ice. If you don't want to have to do that, a portable fridge freezer is the solution for that problem. You can read more about that here: http://www.campingcrap.com/electric-cooler-arb-fridge-freezer-review/.
Whatever type of food you're going to bring, you're going to have to have something to cook it with. A solid set of camping cookware is a must to take with you and these sets can range anywhere from $25 to $100, depending on what you want to include. You'll also need prep bowls, knives, and other utensils to prepare the food with before you cook it. And definitely don't forget the aluminum foil!
Fuel and fire starters are also necessary for preparing food. Bring matches, lighters, propane for your camp stove (if you have one), or you can rub 2 sticks together. Just make sure you have a reliable way to start a fire.
Something else to bring are standard cooking spices. These can vary from household to household, though; my house uses a lot of paprika, while yours may use a lot of onion powder or something else. Bring whatever you use the most often, but definitely don't skip the salt & pepper.