Talk about an answer to a problem no one had. I mean, yes, it's nice that you can buy water for those rare times when your water utility doesn't work (yes, I live in a first world nation), or to keep around in case of a natural disaster, or for when you go camping or something. But really. Buy some reusable jugs and just fill them from your tap.
I have worked in a few buildings where the tap water tasted weird, and then we had a water cooler. My favorite part of having a water cooler around is the hot water spigot. Instant tea! Yeay! But I'm thinking less of water coolers and more about the 12 or 20 or whatever ounce bottles you buy at the grocery store.
I mean, when I go to a restaurant, and they ask me what kind of water I want (tap or bottled or uber-filtered-blessed-by-the-Pope), a little part of me dies inside. It's water, people. H2O. We have the miracle of modern plumbing and water filtration. USE IT. What a freaking waste of money, not to mention all the plastic bottles.
I'll buy water when I'm on the road, but that's because I was too dumb to remember to bring a reusable bottle with me. And because if you want something to drink that isn't sweet, water is pretty much your only choice. When I'm really lucky I can find bottles of Lipton Unsweetened Black Tea. (Thank you, Lipton!) Otherwise I have to find a fast food place that has unsweetened tea. (Which, sadly enough, is usually cheaper..)