I suspect a few of you besides me own and use nalgene bottles.
Here is a nifty invention.. Well worth the money. Easier and better than those little inserts..(i was always having to twist the bottle till I found the opening and then try not to bump my nose..)
Makes those wide mouth bottles easy to drink out of and you can still add ice or whatever you'd like to the bottle with ease..
Its all in the little things...