I prefer to drink soy milk as opposed to regular milk. I honestly didn't see soy milk anyway as an option (although I would love to know where to look for it!). I did, however, bring my own. Eden Soy (my fav brand) makes soy milk is "juice box" sizes. I brought down some of these. They don't need to be refridgerated either. I just drank one before we would head out to the parks in the morning.