This invention discloses a dryer for insertion into a cavity of a reservoir bladder with a fill inlet, a primary internal cavity and a back pocket cavity portion, the dryer including a framework configured for insertion into a water inlet of an internal cavity of reservoir bladder which includes a primary internal cavity and a back pocket cavity portion, and a first air passageway formed by the framework and configured to receive heated air from an air supply passageway and heater, and to direct the heated air to the primary internal cavity. The invention also discloses the framework forming a second air passageway which is configured to direct heated air to the back pocket cavity portion and such a framework providing a biased tab mounted to the framework configured to provide a biased securing tab for applying outward pressure to the water inlet of the reservoir bladder, for securing the reservoir bladder to the framework.