Winter Hike Across Maryland (HAM)

One thing that I have been wanting to do for a few years now is a winter traverse of Maryland on the AT. Didn't do it last year given all the snow, but typically it doesn't seem that bad from the dayhikes I've done on the AT.

The big question that I have is water. I'm planning for a four day venture and am having trouble figuring out where I could actually pull water from on the trail.

Anybody do this before and can help?