Moonwell up date at cord 60,73 after getting the phial then travel back down road tell get to main road go to the bridge when get to the bridge turn south down river stay on west side of river move down river may need to go into the river but stay along river bed you well come to 2 big trees if you are watching screen will tell you are at moonwell turn just to your right and the well will be there
I just completed this quest as a 25 lock, and I can confirm the coords for both the phial (just kill the Laughing Sisters around 62,49 until it drops) and the moonwell (60,72). As a warning, though, stay away from Raynewood Retreat at the top of the hill. I wandered too close to it and got my butt kicked hardcore.
I started this quest from the npc at Thunder Bluff not the guy in Barrens (which the guide says).
Location of this nps/quest giver
Zangen Stonehoof -55,51- Thunder Bluff on the way to hunters rise; near a bridge standing next to a fire in the center.
The Laughing Sisters, (they carry the phials) are from 60,50 and northwards to the base of the tree houses that houses Ordanus. The moonwell is smack dab 60,72.