Wow, now thats a road trip & a half
I usually cut up pieces of fruit & have it in containers for DD (& me) to snack on....peices of watermelon, apple, nectarine. Grapes, mandarines.
Little packets of biscuits (like Tiny Teddies) she thinks they are great because its very rarely she gets them.
Mini muffins, those satchet thingys of custard (Only Organics I think they are)
Anything that takes time to eat & keeps them quiet is really good
Oh & lollies for yourself