Peanut butter is my best friend on the road. (I also like almond butter and sunflower seed butter.) I put it on bread or rice cakes or crackers, eat it with cut up veggies, or smear it on an apple or banana.
Obviously, in addition to PB, I have to bring bread/rice cakes/crackers, tupperware of sliced veggies (carrot sticks, celery, and also whole baby peppers are great), and apples or bananas, also like oranges.
I also like the disposable containers of protein shakes (like Muscle Milk) or the Horizon Organic milk disposable containers.
Pirate's Booty is a favorite for road trip munchies, or a homemade snack mix (with Pirate's Booty, craisins, nuts, etc).
As a PP said, make sure you have all the utensils, etc., that you need (plus a few empty sacks for holding trash).
Have a safe trip.
