A water supply module for hydrotherapy, which includes a pump, a water inlet, a micro bubble water outlet, a pressurized water outlet, a relief valve, and a mixer. The water inlet is connected to the pump. The micro bubble water outlet and the pressurized water outlet are connected to an outlet of the pump. The relief valve is installed in between the outlet of the pump and the micro bubble water outlet, and the mixer is installed in between the water inlet and the relief valve. A drain valve is further connected off the bottom of the pump to drain out the residual water from the pump and the piping. The integrated water supply module provides space-saving advantage. Furthermore, by draining the residual water, the water supply module also improves SPA hygiene by reducing the risk of skin diseases and infections.