This is what the
WDW website says about re-opening the waterparks:
Water Parks
As a reminder Disney’s Blizzard Beach and Disney’s Typhoon Lagoon Water Parks remain closed at this time. We currently plan to reopen Disney’s Blizzard Beach Water Park on March 7, 2021.
Like the other areas of Walt Disney World Resort, we will welcome back Guests and Cast Members to Disney’s Blizzard Beach Water Park in a responsible way, with a plan focused on health and well-being. When Disney’s Blizzard Beach Water Park reopens, it will operate in alignment with the health and safety protocols implemented throughout the Walt Disney World Resort, including reduced capacity, temperature screenings, physical distancing markings and face coverings. Face coverings will be required for each Guest age 2 and up, including but not limited to, at the park entrance and exit, retail areas, and food and beverage ordering areas. Face coverings will not be permitted while experiencing water slides or in the water. You may also remove your face covering while actively eating or drinking, but you must be stationary and maintain appropriate physical distancing.
At this time a park reservation is not required to visit a water park, however, reservation requirements are subject to change. Water parks are subject to rehabilitation, seasonal, weather and capacity closures.