At a minimum, carrying some bread and cheese or peanut butter and jelly would be a good idea. Or if that takes too much space and you prefer to avoid crushing your bread, granola bars cost more but if you have to go for a day on only granola bars you will easily survive. Some sausage meats do not require refrigeration until you open the package, that offers more variety if you get tired of peanut butter and jelly.

When camping, I prefer to cook for most evening meals, the amount of cooking gear I carry varies by trip but it ranges from one small titanium pot to a couple of stainless pots and large fry pan or skillet. A can of soup mixed with some rice can be quite filling.