Yes, you are fully permitted to bring metal water bottles, such as those made by Hydro Flask, Yeti, or S'well, into both Disneyland Park and Disney California Adventure. In 2026, Disney actively encourages the use of reusable bottles as part of its "Environmentalality" initiative to reduce single-use plastic waste. The only restriction regarding containers is that they cannot be made of glass, as glass is strictly prohibited for safety reasons (except for small baby food jars). Security will check your bottle at the bag-check or "Evolv" scanner, and as long as it isn't filled with alcohol, you are good to go. There are numerous "Water Refill Stations" located throughout the parks, notably in Star Wars: Galaxy’s Edge and near most restroom clusters, allowing you to stay hydrated in the California sun without paying $5 per plastic bottle. Using a high-quality vacuum-insulated metal bottle is actually a "pro tip" for 2026, as it can keep your water ice-cold for over 12 hours even during a sweltering July afternoon in Anaheim.