Yes, Universal Orlando Resort has made it much easier to stay hydrated by installing Coca-Cola Freestyle machines throughout both theme parks and CityWalk. While these machines are primarily for guests with refillable soda cups, they also have a "Water" button on the main screen that anyone can use for free to refill their own water bottles with chilled, filtered water. In addition to the Freestyle machines, you can find traditional drinking fountains near almost every restroom and even inside some attraction queues. Most Quick-Service restaurants will also provide a free cup of ice water upon request, which you can then pour into your reusable bottle. Universal allows you to bring in your own water bottles (up to 2 liters, no glass), and utilizing the Freestyle machines is the best way to avoid paying for expensive bottled water while navigating the Florida heat.