I'm going on a school trip and need healthy snacks that will last for a 24-hour bus ride. Help please!?

I need snacks that will last most of the bus ride. We'll be stopping along the way for meals, but woman can not live off of Wendy's and bad truck stop snacks alone! I don't want to bring snacks that will go bad or make me have to go to the bathroom a lot (we all know that on-bus bathrooms are disgusting). Please help! I'm trying to lose weight before summer comes around and I can't do that if I'm only eating chocolate and gummy bears on this trip.