Hi, Kimberley!
Currently, there are no refillable drink cups at the
Magic Kingdom. You can pay for drinks as you go, use a snack credit for a drink (if on the Disney Dining Plan), or ask for a complimentary cup of ice water at any counter service location. If you are on the Disney Dining Plan, you also get a drink with any meal.
Refillable drink mugs are available at
Disney Resort hotels. For a one time charge (about $17, subject to change) you receive complimentary soda, tea, and coffee for your length of stay at Disney Resort hotel beverage stations. They even have a handy mug-wash station to keep your mug fresh and clean! Guests on the
Disney Dining Plan each receive one complimentary mug with the plan.
Whatever you do to get your drinks, stay hydrated. Take plenty of breaks in the shade with a cool cup of ice water. It can really keep you energized for the magic! Enjoy!
Cathy