I usually use the HDPE (translucent white) bottles as my "good" bottles and the cheapie PET/PETE 1 bottles for drink mixes.

I have my dad's old poly carb Nalgene and and a poly carb Nalgene I found out in the mountains, but I don't use them much anymore. I think for short term use, they'd probably be fine, like filtering water into them to carry from a creek back to camp with the water being used that night for drinking, cleaning, hygiene, etc.