aluminum foil 
campfire coals 
long fire tongs

1 pkg pita bread
1 can spaghetti sauce
1 cup grated cheese
1 pkg sliced pepperoni
optional: sliced black olives, pineapple chunks, diced peppers, ...

Use precooked meat since you are just heating it up. 
Mark your own foil with a special fold so you know its yours.

Cut each pita in half and spoon spaghetti sauce into pocket spreading it evenly.
Add cheese, pepperoni, and other toppings.
Wrap in foil and place in coals. Cook for a couple minutes, flip, and cook another two minutes.