Yes, you can bring ice water into Disney World and Disneyland in 2026, but there is a crucial catch regarding the ice itself. Disney has a strict "No Loose Ice" policy; you cannot bring a cooler or bottle filled with loose ice cubes because they interfere with the security scanning process (the dense mass of ice blocks the X-ray's ability to see objects hidden underneath). However, you can bring ice that is contained within a sealed, reusable water bottle or a Ziploc-style bag. Furthermore, Disney is very accommodating with water; in 2026, any "Quick Service" food location in the parks will provide you with a cup of ice water for free upon request. Many savvy visitors bring an empty insulated flask (like a Yeti or HydroFlask) and fill it with free ice and water inside the park to keep their drinks cold all day without having to carry the weight of the water through the security checkpoints.