Yes, you can absolutely bring a reusable water bottle to Disneyland Park and Disney California Adventure in 2026, and it is highly recommended to save money and stay hydrated. The only major restriction is that the bottle cannot be made of glass, as glass containers are prohibited for safety reasons. Most guests opt for insulated stainless steel bottles (like Hydro Flask or Yeti) to keep water cold in the California sun, or lightweight BPA-free plastic bottles. Throughout both parks, Disney has installed numerous refillable water stations and filtered fountains, often located near restrooms or in high-traffic areas like Star Wars: Galaxy's Edge and Avengers Campus. You can find the exact locations of these "Bottle-Filling Stations" by using the search feature in the Disneyland mobile app. Additionally, any quick-service dining location will provide you with a free cup of ice water upon request, which you can use to top off your bottle if you aren't near a dedicated refill station. This remains a "gold standard" budget tip for any Disney traveler.