Is a Cold Drink "Worth the Weight"?

While I have learned to accept that lukewarm water is a fact of life when spending long days outdoors, that doesn't mean that I don't dream of having a cold refreshing drink on hot days at the crag or on long summit approaches. Unfortunately in Southern California cool refreshing mountain streams are hard to come by. Always trying to be conscious of weight… I contemplated the pros and cons of an insulated water bottle.