That's really handy, but I'm trying to get out of the habit of using disposable plastic bottles. I haven't made much progress, except feeling guilty about using them.
Those are handy. We've talked about getting them but in the end don't have much use for them because we drink very little bottled water. We take Sigg bottles to work every day and a Camelbak to the parks.
I just drink it room temperature. Too much hassle!