In 2026, Disney Cruise Line allows guests to bring as many factory-sealed water bottles as they wish, with no specific limit on quantity or size, provided they are packed in your carry-on luggage. You are strictly prohibited from placing water bottles (or any liquids) in your checked suitcases, as they could leak and damage other guests' belongings. Because carry-on bags must fit through a standard 9" x 14" x 22" security scanner, the physical size of your bag is the only practical limit. It is a peer-to-peer recommendation to use a small rolling suitcase specifically for your water to avoid lugging heavy weight around the ship before your stateroom is ready at 1:30 PM. For those who want to skip the heavy lifting, Disney also offers "Onboard Gifts" water packages that can be delivered directly to your room, and there are free, 24-hour filtered water stations located on the pool deck.