jaiden
Dissolving anything in water lowers its freezing point and the only variable is how concentrated the solution is. <img src="/forums/images/graemlins/wink.gif" alt="" /> I might suggest dissolving some hydrogen hydroxide in your water... <img src="/forums/images/graemlins/grin.gif" alt="" />
Jim YMMV
P.S. If your water frezes in your pack at 10 degrees then it was on the outer edge. Wrap it in a bag and put it inside some spare clothes or something deep inside the pack, BUT this shouldn't be required at 10 degrees.
<img src="/forums/images/graemlins/smirk.gif" alt="" />
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These are my own opinions based on wisdom earned through many wrong decisions. Your mileage may vary.