Nalgene bottles come in 2 grades. There is a white plastic which can make things taste plasticy and they can stain. Oh, if you put, say, curry in your white bottle and then wash it and put in water, it will taste kinda curry-ish! So, great for water or any other liquid, as long as you stick with that liquid.
Nalgene also comes in a tough lexan, which now comes in a few colors. Tough bottles which don't give off plastic taste or absorb tastes. Theya re a bit more $, but worth every penny.
The bottles come in a few sizes and with a couple variations in top sizes. For me it is best to get the wide mouth ones, as I can get replacement tops for wide mouth ones much more easily and cheaper than for the narrop top ones.
I have had Mr. Nalgene (yes, I named my bottle) since March and I love it. Oh, the bottle has measurements on it, which i have really coem to enjoy. Monitoring my water intake is fun to do now, and a great thing to do for my health. Mr. Nalgene is great.