Now that the summer is starting, I notice again the plastic taste in my water whenever I go on a ride. It always makes me wonder whether I am drinking something in addition to the water I put it the bottles. Does anyone have any idea of how long plastic water bottles can be used without significant degrading?

Who is using Sigg bottles? I love the look of Sigg bottles (I have been lusting after the yellow sports bottles I see in the local Whole Foods Market). Anyone using Klean Kanteen bottles? Pros and cons?