Take the corrupt water to the Barrens, <name>. South of Ratchet, hidden along the shore, is an old friend of mine, a shaman named Islen Waterseer. She is a powerful shaman who will help us. Her relationship with the spirits of water has always been strong. Our task being a noble one should be enough to persuade her and the spirits of water to aid us in this task.
You should find her at a small camp right along the water's edge. And, <name>, ignore the pirates... they are but a nuisance and no threat to you.
Ah, you need the water from this Moon Well cleansed. Stopping this force of malice in Felwood seems noble enough, but it is not for me to decide if the water will be purified. I will ask the spirits of water--it will be up to them to decide if the cause is just.
Give me a moment and I will tell them of your plea. I hope they are as sympathetic as I am to your cause.