Flip! I just changed bottles. So, it took me eight days to drink a six-gallon bottle of water. Three-forths of a gallon per day. Of course, other people will occasionally drink out of my water cooler, and once in a while, I'll use it for tea, which shouldn't count as water consumption. But, then again, I probably more than make up for that with the water I drink at home and elsewhere, so we'll call it a wash to keep things simple. Oh wait, I didn't come into the office last Saturday or Sunday! (I worked from home, of course -- lest you think I was slacking. ;-) So that makes it a gallon per day.