Abstract: A water bag is provided with an expanse of material extending across a lower portion of a bag wall to provide a pocket into which may be inserted a heat pack or a heat sink. Conduits are provided on the interior surface of the bag wall adjacent the pocket with bag contents flowing through the conduits and heated by the heat pack in place on the bag exterior. A bag outlet defines a mixing chamber which receives bag contents from multiple passageways. A valve regulates discharge flow from the bag.