Nalgene will be discontinuing production of their polycarbonate (#7) plastic bottles due to the concerns over the possible toxicity of bisphenol-a (for the interested, Nalgene does carry other varieties of their product that do not contain the chemical).
In doing a little more searching, I found this Johns Hopkins interview (albeit from 2004) that allays fears of drinking from plastics. Also, you can still use your water bottles, you just have to stop using them once they become cloudy or cracked. You should also be particularly careful in how you clean them out of bacterial concerns (REI recommends that you let them air dry completely before refilling).
And just for further reading, what all those numbers (Resin Identification Codes) mean.
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