Abstract: A heat exchanging coil is immersed in water in a heating pod heated over a fire or other heat source. Flexible tubing connected to the coil transmits heated water or other fluid under pressure from a water pump in a reservoir connected to the tubing. Loops of the tubing pass through various items used in outdoor activity including sleeping bags, tents, heaters, bowls, chairs, and even a shower. The heated water is pumped intermittently in a continuously recirculating flow through the system from the heating coil through the item(s) and back again through the heating coil. A timer connected to the pump allows flow of the heated water bolus at any desired timed interval. Alternately, cold water may be circulated through the system for cooling in conditions of extreme heat. Ice or snow or cold water may be used in the heating pod and the pump activated to circulate the chilled water.