I don't know if there's a problem with coffee, but this morning, I realized that I forgot my insulated cup at the office yesterday. So, I pulled out my Eddie Bauer lexan bottle (same as Nalgene) and poured 32 oz of nice hazelnut & vanilla coffee into the bottle. The liquid wasn't boiling but it was very hot. Brought it to work and kept drinking on my way. I didn't put the lid on though, I was worried that it might leak or explode or something.

No bad taste, no nothing. I rinced it a minute ago and put fresh water in it... sounds like this might retire my insulated cup.