Abstract: A stackable, lightweight water dispenser bottle and method of using a plurality of such bottles in conjunction with a conventional water cooler is disclosed. The bottle comprises a generally parallelepipedal container body with rounded edges and corners with a plurality of dimples in a top portion and complementarily shaped protuberances on a bottom portion. The top portion has a central depression therein with a round hole surrounded by a cylindrical collar sealed by a screw-on cap. A neck portion rising from a central depression in the bottom portion terminates in an opening communicating with the interior of the container body and is sealed with a plastic cap after the water bottle is filled. A first such water bottle can be inverted and sealingly inserted into the opening at the top of a water cooler to partially fill the cooler.