For summertime camping, I've found that one gallon milk jugs work much
better than smaller bottles, simply lasting longer in the frozen state.

Karl Wolz

 I have many bottles of water that I bought wherever
(hellmart or the grocery store) that I put in the deep freeze (after pouring
out the 12% (+/-) for expansion). I look for a bottle that seems pretty
sturdy on the shelf; the best of these seem to be the cheap store brand
drinking water. The only time I can recall breaking any is when I hit them