Seconding Irn Bru, as long as its feasible for you to make money on it. Along those lines, it'd be cool to try out Club Mate but its not even remotely inexpensive. I'm all about blueberry Red Bull as a substitute for Bawls, too.
As far as snacks, I'm rather fond of anything that is either gummy or hard candy. The kettle chips were good and the variety was nice. Chex Mix or Gardettos would be cool, as its savory and snackable.