Hiya Jenn!
Water you doing soon?! You're going to The Most Magical Place on Earth, that's what! Before you know it, your trip will be here, and I'm glad you stopped by planDisney!
Jenn, you've asked a great question since staying hydrated while visiting sunny Florida is essential. You'll be doing a lot of walking, so I love that you're planning ahead. I'm happy to tell you that you're welcome to bring your water-filled hydration pack to the theme parks. The only parameter to watch out for is that your backpacks are
no bigger than 24 inches long by 15 inches wide by 18 inches high. Typically hydration packs aren't that big, but I wanted to mention it, just in case.
You'll also be happy to find refill stations scattered throughout each theme park. I'll list the spots I know below by theme park.
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Magic Kingdom Park: Inside Cosmic Ray's Starlight Café.
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Disney's Hollywood Studios: You'll be able to locate one outside of the restrooms in Star Wars: Galaxy's Edge, near the exit of Millennium Falcon: Smugglers Run, and outside of the park near the bus stop.
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EPCOT: There is one near the restrooms between Test Track and the Mexico Pavilion.
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Disney's Animal Kingdom Park: By the queues of Na'vi River Journey and Avatar Flight of Passage.
The hydration stations make it super easy to refill your pack; however, if you're far from the refill stations and don't want to walk over to one, you can always ask a friendly Cast Member for complimentary water cups (with or without ice) at most quick-service dining locations.
Wishing you an enchanting visit, Jenn!
Aena