I don't think we need to shame occasional bottled water users. I occasionally bring some with me on driving vacations. I probably use <20 bottles a year. Contrast that with the crazy people I see wheeling three grocery carts full of water bottles when they are on sale at No Frills. Or my neighbour who fills his blue bin to the brim primarily with water bottles.
Those were the ones I was thinking of; the people who can't seem to function without a water bottle in their hands, even moving around in an office environment(not to be confused with people who constantly have a disposable coffee cup in their hands). If you're exercising or doing heavy work - sure. I go through some when I'm motorcycling in the summer.