https://consumerist.com/2017/08/17/national-park-service-changes-its-tune-ends-ban-on-disposable-water-bottle-sales-in-parks/

In a move meant to “expand hydration options” for visitors to national parks, the National Park Service is reversing a six-year-old policy that allowed parks to ban the sale of bottled water.

NPS announced that effective immediately, the water bottle ban “has been rescinded to expand hydration options for recreationalists, hikers, and other visitors to national parks,” noting that the ban “removed the healthiest beverage choice at a variety of parks while still allowing sales of bottled sweetened drinks.”