I have a 1.5 liter water bottle (had Dasani water in it at one time) I have a RO water system at home because our local tap water is so bad. I fill up my water bottle before work and take it with me everywhere. I have found that carting it around with you makes you drink it without even thinking. When I get home form work it is empty and I fill it up again and have to drink it before I go to bed. That is 100 ozs!

On a funny note though, I had to sit through a three hour meeting at work yesterday and I was so bored I ended up drinking the whole bottle, I had to pee so bad by the time the meeting was over! We were in a small room and I would have had to make a bunch of people get up if I were to leave to go to the bathroom, so I waited it out.