I'm not that big on environmental stuff but I do like a bit of common sense. If we are talking about saving the world and using less oil then perhaps we should not be packing our water up in 2 slabs and selling it in bottles.
I am seeing many people at the moment decide they will drink the water in 500 ml units. That water needs to be bottled shipped and the bottles recycled ( if we are lucky) rather than opening a tap of some sort.
It saddens me when I see people who consider themselves to be environmentally aware just chugging out of a cheap hdpe bottle. And telling me what I should do about my own environmental footprint.