We do offsite "condo" setups and this is what we did.
Breakfast ~ Muffins, bagels, rolls, butter, yogurt, grapes, orange juice for park days. No park we might have eggs, bacon and bread.
Lunch - In parks. Will have some cheese, lunchmeat and rolls in unit for anytime.
Dinner - Depending on park hours some in parks and some in unit (although usually later than we normally eat). I go to COSTCO and get premade meals. At home I split them up, seal in Foodsaver and freeze. Bags of premade salad mixes. Few cans of fruit cocktail. Big bag of rolls. Morning of use I pull package from freezer to fridge. Quick to put together and a decent meal.
We have extra snacks, fruit, cookies to nibble. While we eat in, I don't want it to be hard work or take too long.
AND most trips I take Honey Baked Turkey (or ham), bag of rolls, packs of cheese. Not unusual for us to make a sandwich for park or have for dinner in unity.