Well I don't know what their policy is, but they allowed it. We had snacks in my stepdad's backpack everyday that we went to Sea World and Universal. It really cut down on costs, and they just don't sell snack stuff in the parks (cheese it's, ritz bitz, cereal bars, etc). I'm not a big fan of it if I have to carry it, but sometimes it's really nice to have some of those comfort foods from home. I saw a lot of people with what was definitely outside food, so it must be allowed. Don't know about water bottles; we usually buy drinks in the parks, since they're cold that way, but if they're letting food in then I expect they let water bottles in too.