Yes, you can take a Hydro Flask (or any reusable insulated water bottle) into Disneyland in 2026, but there is a specific new safety caveat for thrill seekers. While Disney encourages bringing these bottles to stay hydrated in the California sun—and provides numerous "refill stations" throughout the parks—a new 2026 policy at high-speed attractions like the Incredicoaster requires all heavy, metal water bottles to be stowed in a bag or left in a designated bin. Because large insulated bottles can become dangerous projectiles at high speeds or during inversions, they are no longer permitted to be held or placed in the "floor pockets" of certain rides. Beyond this, ensure your Hydro Flask does not contain alcohol or glass, as both are strictly prohibited. For a 2026 visit, bringing your own bottle is a "pro-move" to save $5+ per bottle of water and take advantage of the free cups of ice water available at any quick-service dining location.