When we take road trips of any type we have loads of bottled water on ice
A roll of paper towels
Plastic grocery bags for trash/waste
Some old towels and/or blanket to sit/relax/eat on
oh... do you mean to eat? HA!
If we head out early, we take our breakfast with us to eat as we drive towrads our destination, such as Spam Musubi
, Breakfast Burritos, Bisquits filled with eggs & bacon/sausage/ham/cheese (not all but a couple ingredients)
Snacky stuff is good too: nuts, cut up fruit, candies, cookies, crackers, cheese
Lunch is a toss up, just depends on what we feel like: leftover cold pizza, sandwiches made on site (pre-made sammies can get soggy), a thermos of hot soup if it's a cold day ... the choices are endless.