Many people report their ankles swelling, but in truth, it isn’t from the water. It’s from the food. The water is desalinated. But many people don’t use a lot of salt on there food at home and react badly to the salted food served in the dining room and buffet.
And if you think about it, you can’t really avoid the water on the ship because it is used to make the ice cubes, the soup, the juice drink, the lemonade, the iced tea, the coffee, etc.