I finally copped out last night and bought a Nalgene bottle from REI. Nothing betrays a traveler as a Yank more plainly than Nalgene bottle... I saw far too many while cruising around last year. But they're definitely popular for a reason. I'm trying to consume the recommended 2 liters of water per day, and this 1 liter bottle combined with the filtered water from the snackroom seems like the optimal way to go about it. Sure beats throwing away a bunch of plastic bottles every day...