Here are some non-BPA refillable water bottles - a good alternative to buying plastic water bottles. Positives: they are safe, you don't have to pay for each time, and you don't have to think about if your recyclables are actually being recycled or are going to fill up landfills...
Sigg (though get the BPA-free kind)
As an alternative to the options listed above you can purchase a Thermos and help support charity:water build wells in Africa.
Wait, why shouldn't you use plastic water bottles again?? Here's why. And here's a short video on plastic in the Pacific (including inside the stomachs of birds and fish) by Captain Charles Moore who discovered it.
Thanks to the HEN list-serve for these (and for this article from Enviroblog).