Though most of us aren't lucky enough to attend the Sundance Film Festival [1], we've probably all been to events that hand out hundreds and hundreds of plastic water bottles. Last year, Sundance alone gave out 50,000 single-serve bottles, most of which just end up in landfills.

So for the 2009 festival, which kicks off this Thursday, Sundance is partnering with an organization called FilterForGood [2], which is devoted to reducing bottled-water waste. Instead of wasteful one-off containers, festivalgoers will get free reusable water bottles provided by Nalgene, which they can then refill at Brita-sponsored water stations.

I've had a reusable water bottle [3] for a while now, but if you haven't gotten one yet, you can visit FilterForGood's site and make a pledge [4] to switch. The site also sells FilterForGood [5]-branded bottles that let you support the cause. Don't worry: They're BPA free [6]!