Today I stumbled over these super awesome choo-choo train birthday party stuffs at poofycheeks.com. There are (as shown below) cupcake toppers, bottle labels, (not shown below) invitations, and "thank you" medallions.
This set of pictures shows the bottle labels on what looks to be an old milk bottle, but on mini-water bottles, or even affixed to side of a 2-litter, or on your Kool-Aid picture and then others on paper cups would still be just as cute! :)
CONTRIBUTOR: -Stephanie Corchado-C. of LIFEINENGSPANOL.BLOGSPOT.COM