When are you planning on doing this? I'd join :-D
I was going to say just tank up at all the huts along the way, but I just realized Madison and Lakes of the Clouds are closed for the season now.
In that case, I'd tank up (drink lots, leave with one liter or so) at Pinkham, Washington, and Mizpah (it's a short detour to mizpah from the crawford path), and bring a handful of aqua mira/micropur tabs for filling at water sources along the way (filter would be fine, too). There won't be so many sources above tree line as there are below, but there should still be plenty flowing.