My advice - DON'T DO IT!
Ditch the hoze, it's just not worth it. I teach winter camping in idaho, wyoming and alaska.
Everybody wants to bring their hoze system, and I can't even begin to tell you how many times I've heard: "Oh NO, my hoze is frozen!"
In winter - you have to reach into your pack to get a bottle out. THat said, a platypus works INSIDE your ack, just don't use the hoze.
IT WILL FREEZE!
I've camped at 40 degrees below zero with beginer students. No hoze - I don't care what tricks you have - will stay usable!
peace from driggs,