My buddy Tim (from Vermont; the guy who’ll be hiking the first 2 weeks with us) asked me what I was doing for water bottles. He suggested using a hydration pack (one popular brand is Camelback). I have one, but never used it much. Tim said he liked his so much (since you don’t have to dangle a bottle off your belt or stop and to get a drink), that he thought I ought to try it.
I dug mine out of the closet, stripped the bladder out of its own pack (so as to not carry the extra weight), filled it up (~2 liters), and slipped it into the internal bladder pocket in my pack. I’ve been using it on my last few prep-hikes. I’m sold. I found today that when it’s about 10 ºF outside, it’s best to keep the bite-valve tucked inside your jacket so it doesn’t freeze up!