Yes, you are absolutely allowed to bring your Hydroflask or any reusable metal water bottle into Disneyland. In 2026, Disney's official policy welcomes non-alcoholic beverages in the parks, provided they are not in glass containers, which are strictly prohibited for safety reasons. Metal bottles like Hydroflasks, Yetis, or Klean Kanteens are perfect for keeping water cold during hot California afternoons. You can refill your bottle at numerous "Hydration Stations" and water fountains throughout the parks, or you can request a free cup of ice water at any quick-service dining location. When passing through security, you do not usually need to empty your bottle like you do at an airport, though security cast members may ask to inspect it. To make your day easier, consider a bottle with a handle or a carabiner, as larger metal bottles can become heavy to carry while walking the 10-12 miles common during a full day at Disneyland.