The peanut butter and bread mentioned is my standard emergency food that I almost always carry in case the planned grocery stop doesn't materialize. For cooked meals I like various pasta options - mac/cheese, spaghetti, etc. I usually add some extra ingredients like tuna and vegetables. Grocery stores usually carry a variety of 'all included' pasta meals that are about as light as freeze-dried but tastier and much cheaper. They also frequently have sub sandwiches that are reasonably priced and travel well.