A good trick to use is to freeze your water bottle the night before, then you will have ice for most of the day and it's no problem to fill up at the water fountains. Incidentally, I think (as a sweep) that the best water fountain is the one at the back of the Sky Ride station near the Main Gate, or else between the Gemini restrooms. They're both out of the way so they're not abused so much, and they always seem to be cold!
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PO!NT OF VIEW - A Different Look at Roller Coasters
http://www.crosswinds.net/~justmayntz/thrills/