A device for providing medication for injection by a jet injector includes a cassette which connects an injector system to a reservoir. The warmer pack are formed of ceramic materials, high density liquids, PCM’s or the like which are capable of being rapidly heated during the brewing process but then gradually release their heat to the beverage in the urn. The center of rotation of swinging movement in the supporting mechanism is positioned below the board 14B. When the reactant inlet is in the closed state, the first endothermic reactant is isolated from a second endothermic reactant and no endothermic reaction occurs. In the rear-facing position, the seat member is positionable in different orientations to compensate for the angle at which the vehicle seat is formed.