Hi, Florence!
You are welcome to bring water, snacks, and beverages in to the Walt Disney World theme parks. Items must be available for
inspection, and brought in a small, soft sided cooler (no coolers on wheels) and no glass bottles or alcohol.
Bottled water is available for purchase at most kiosks and quick service locations. A regular bottled water is about $3 (prices subject to change). However, the better way to go is to ask for a free cup of ice water at any
quick service location. They will happily give you a cold cup of water with ice, yours for the asking! (You need to go to an actual counter for this, not a kiosk.) I like this option since we can enjoy a quick drink and not carry around water bottles all day. Plus, it is quite a money saver!
So it seems your water options are plentiful: bring your own, buy bottled water in the parks, or simply ask for it for free at counter service locations! There are also the standard water fountains throughout the parks for a quick drink. It seems like Mickey and his Pals have taken great care to make sure you stay hydrated!
Have a magical vacation in Walt Disney World.
Cathy