I picked one of these up the other day and wow...works well!
http://www.waterbobble.com/#/Bobble-Water-FrontPage
It actually filters the water as you drink. I think it was around $8 or so.
http://www.waterbobble.com/#/Bobble-Water-FrontPage
It actually filters the water as you drink. I think it was around $8 or so.