Although sometimes depending on the type of boat seems that we are in a big hotel, the freshwater onboard is not unlimited and is a precious resource that we should use with responsibility. Use for your shower just the necessary, remembering not to leave the tap open when you wash your teeth or while washing the dishes. Try to use if possible ecological and special marine soaps use the minimum amount needed to protect the environment.
Additionally, the water from the tap is fresh water from the tanks, which is useful for wash your hands, and taking a shower, but normally there are not filtered so it is highly recommended to buy mineral water. Be sure with your crew and skipper to have enough provisions of water on board.