Yes, you can easily fill a water bottle in Disneyland, as the park has significantly expanded its hydration infrastructure in recent years. There are numerous dedicated bottle-filling stations located throughout both Disneyland Park and Disney California Adventure. In Disneyland Park, key spots include Red Rose Taverne in Fantasyland, Galactic Grill in Tomorrowland, and the Black Spire Outpost restrooms in Star Wars: Galaxy's Edge. In California Adventure, you can find stations in Avengers Campus near the Ancient Sanctum and in San Fransokyo Square. A "pro tip" for the coldest water is the filtered dispenser inside the Baby Care Center on Main Street, which is accessible to all guests. Furthermore, any "Quick Service" dining location that serves fountain drinks will provide a cup of ice water for free upon request, which you can pour into your own bottle. Bringing a reusable, insulated bottle is highly recommended to save money and stay hydrated in the California heat, as bottled water inside the parks can cost upwards of $5 per bottle, making the free refill options a major budget saver.