I prefer a water bladder - 2L. My 3L finally started to leak after 10 years of use. To prevent freezing as mentioned before, always blow back into the bladder to clear the line. If the tip freezes, put it in your pocket for a minute.
I also carry a single wall aluminum .5L bottle that weighs 3oz for hot coffee, and back up water. I use liquid drops as water treatment when I know good water is around so while my main is being treated, i have the spare to drink while I keep hunting. If I need it, I also have an 8L bladder for camp water in a group.
The problem I have with nalgenes or similar are that you have to stop or slow down to drink. Also they take time to refill more often. With a bladder my eyes are always looking ahead, and I can refill quickly to stay in the game. It all depends on how and where you hunt. High country with low deer numbers means Im moving a lot and looking all day. If I had better areas where I could use my eyes more, I could easily switch to just bottles.