This is an emergency water packet that can provide chilled drinking water to soldiers, fire fighters, athletes, hikers, cyclists, campers, scouts, Red Cross, and commuters stuck in traffic.  

The water packet uses evaporative cooling to chill the water before being opened.  The hotter and dryer the climate, the more effective the cooling.

Drinkable water is sealed in the inner pouch which is connected by a string to the outer packet.  The inner water packet is coated with a paper-towel like material that traps moisture that evaporates and cools the water when twirled on the string.

Moisture in the covering (like a thick paper towel) on the water pouch evaporates to provide evaporative cooling.

Spin the water pouch about 20 times, to speed up evaporation to increase cooling. 

After the inner packet has been cooled by evaporation, it is torn open for drinking.

After lamination through rollers, the material is folded over before going through heat-sealing rollers to form a pouch that is water tight on the bottom and sides.  The pouch is filled with clean water before being sealed at the top, trapping one end of the string.  The inner packet is then separated and moistened (in a later operation).

The inner packet, with its attached string, is sealed in an outer pouch made of the same water-proof film (3M Scotchpak LF200M polyester) which has been pre-printed with instructions.  In this sealing operation, the free end of the string is trapped in one edge of the outer packet which will serve as a handle when spinning the inner packet to cool the potable water.

U.S. Pat. 7,682,639
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