Abstract: The invention relates to portable liquid dispensers for transporting large quantities of liquid to a predetermined location and for dispensing the drinking liquid on demand. The liquid dispensing unit provides for the use of a hand truck which supports and carries an insulated hollow container suitable for retaining the drinking liquid. A rechargeable battery is positioned in a housing, the latter being detachably secured to the frame of the hand truck. A pump, electrically connected to the rechargeable battery, has a pressure switch which is activated when a drop of pressure in the fluid line is detected. The intake side of the pump is connected by a flexible hose to the interior of the container and the discharge side of the pump is connected to a manifold carried by the frame of the hand truck.