I remember when bottled water was new and a big joke...like, who on earth would want to pay for water when you can just get it from the tap? Yet now bottled water has become so "de rigeur" that we have the mistaken impression that basic tap water is somehow really bad for you.
Well, bottled water is horrible for the environment. First you have to package the water in these awful plastic waters, and then you have to pollute to ship the water across state lines. It's an environmental nightmare.
Many cities are now discouraging bottled water use.
I used to be a little embarrassed when people came over and asked for water and all I had to offer was tap. (The look on some people's faces was enough to make it seem like I was offering them stale cat urine!) Now I do it unapologetically, always with the proviso that "bottled water" is bad for the environment and 9 out of 10 times, is just fancily packaged filtered tap water. I also have the greatest water bottle (from REI) that I carry around everywhere. Tres stylish!