Once upon time, not so very long ago, carrying a water bottle around with you was a sign of good health and - by extension, because healthy people are usually assumed to be environmentally sensitive - green consciousness. It showed that you valued water! It showed that you valued water enough to pay for it instead of just drawing it from your tap! It showed that you were the sort of person who needed to have water at her side at all times!Now, of course, it just shows that you're way behind the times, or, at least, terribly misinformed about water and plastic.