Abstract: A system for supplying water from a bottle to a faucet and an auxiliary device on demand. The inventive device includes a water bottle for storing a quantity of fresh water. A demand pump fluidly communicates with the water bottle and creates a pressurized output of water from the bottle. The demand pump is responsive to a drop in output pressure such as occurs during opening of a faucet or operation of a refrigerator ice-maker so as to supply water from the water bottle to such devices.