Eli,
No water on the Green Mt. Ridge. Nice campsite at Green Mountain. There's a steam when you begin to bend north to go around Mt. Hardy that the trail (MST) crosses @ 1/2 mile before the right turn to Green. Get plenty there.
The last 2-3 miles of the Green Mt Ridge before 215 drops about 2500 feet or more. Often 25% to 30% or more. It is a bear and beyond; approaching dangerous if the roots/leaves are damp and slippery. Just falls straight down the ridge. Be prepared!
Also in higher water crossing the pigeon is not easy. The crossing is about 200 yards upstream from where the green mt.leg meets the road. There's a house sized rock in the stream with remnants of what used to be a dam or something like metal rods sticking out if I remember correctly and maybe part of a wall on the far side?. People use the big rock to dive into the nice big swimming hole. The crossing is @ 60 yds or more up from that.
The trail follows the river upstream a ways and the turns left and goes up a small side stream @ 3/4 mile? before beginning a series of about 10/12 switchbacks and you top out on the ridge in near virgin hardwoods. I'd get water from this stream before the switchbacks. Nice camp-site right there on the first ridge top with the big hardwoods but dry. The trail back along fork ridge to Ivestor gets elusive at times but may be easier to follow now if not hidden in knee deep ground cover like it was mid-August when I did it. Seems to basically skirt the knobs to the left or north side. I'd maybe get a couple of way-points along there just in case. There's a beautiful open meadow/bald about a mile before the trail meets the road/trail to Ivestor; You can see it on google earth. It's a great campsite and there may be water a ways up the trail towards Ivestor and over to the left/north just where the trail begins to leave the open Bald area and re-enter the woods. Pretty and varied scenery……….but that last leg of the descent down Green Mountain Ridge to 215 is an effort. I'm going down the valley west of the Green Mountain Ridge next time………but do that ridge once at least. Its a pretty hike.
PS: Mt Tennent is pretty. Also if you have already done the last stretch on the MST back to 215 consider a detour up to Sams Knob and down Flat Laurel Branch or creek, whatever it's called to the car park at 215…….IF you haven't done that stretch of the MST by all means take that as it's also really pretty. If you have the time and haven't been to Courthouse Rock take that side trip. You've planned a really nice loop; maybe one of the best I've seen in NC for huge views, great scenery and variety with up to 5 6000 footers along the route, large balds and pretty expansive open meadows,waterfalls, big canadian zone red spruce and some really big hardwoods out fork ridge. It's like a Whitmans sampler of high Appalachian scenery/ terrain and botany, ( and frankly imho kicks azz on Roan but hey everybody has an opinion.what r blogs for? ) And PPS: the bears around there are regularly and strongly discouraged from the presence of people.