All this pee bottle talk I have to share a humorous aside.

Guess what marathon canoe racers do?

Well some start by drilling small holes in their canoe seats to aid drainage. Splash a bit of fresh water in their laps and keep going. I could never pull the trigger, tried, but I'm guessing it's an aging thing. Women seem to have an easier time of it, as some can even keep paddling while going. Another multitasking skill.

Back on topic.
The only nalgene bottles I've seen break are the milky white ones. They seem to get brittle with age.