Hi Denise -
We always bring in frozen water bottles and drink thru the day and refill as needed from fountains. Many here may tell you that the fountains are germy, warm, and taste terrible -but on 6 trips I have get to have any of us get sick and the water tastes great to me - actually better than in the Disney resorts!!JMHO..
Hydration is really really important - everytime we fill up, I think that's buying us another few hours of energy!!
Enjoy!
melomouse