I'm not from the UK, but the US. I hope it's okay for me to be reading and posting to your threads. I've enjoyed talking to many UK families when I am at Disney World. I can tell you that the water in Florida is rather disgusting tasting, not harmful, just awful; it's their processing system. However, as for Disney World, most of the restaurants and quick service locations have filtered water. There are just a few in the parks that do not. I buy bottled water for the hotel room and when I'm at the parks, I just go up to any counter service window and ask for a cup of ice water. They provide it for free. You don't need to buy water in the parks or use the gross water fountains. Just ask for how many cups you need, they don't mind. It is especially convenient in the really hot months, every few rides I just get new cups of water to stay hydrated and throw them away when I get to the rides. Everyone, have a magical trip to Florida and stay hydrated, but save your money!