no, you shouldn't put hot water in nalgenes

Nalgenes (lexan) with hot water can leach BPA, a possible cancer causing substance.

Therefore, I will not put instant noodles in my nalgene and try and cook with it. We probably won't need to anyway, because you can get cup-noodles.

Just because the bottle doesn't break doesn't mean its not leaking chemicals.

This product is not dishwasher or microwave safe. http://www.nalgene-outdoor.com/store/detail.aspx?ID=89