Hi Sue,
Thank you so much for visiting the Disney Parks Moms Panel with your question. We on the panel love helping guests to plan magical vacations!
Staying hydrated while on a Walt Disney World vacation is a great first step to having a wonderful vacation. There can be a lot of walking involved with a Walt Disney World vacation, and keeping up with water intake is important.
I have great news for you, Sue! You are absolutely welcome to bring your own water bottles to the Walt Disney World theme parks. My family does this, and we find that having our own water bottles with us at all times encourages us to stay hydrated. You can refill your water bottles at water fountains throughout the theme parks. You can also always ask for a complimentary cup of iced water at any quick-service dining location. We often do this and then use the refreshingly cold water to refill our bottles. Just be sure that the bottles are not glass, as glass is on the list of
restricted personal items for Walt Disney World theme parks.
I hope that this information is helpful for you, Sue! Please do let us know if you have any further questions.