This quest is not available in game.
Far Seer Mok'thardin of Grom'gol needs Holy Spring Water. He also wants you to kill 10 Naga Explorers.
There is but one final reagent needed to complete the enchantment.
In the south, towards the western coast, high above the bluffs, lies a Holy Spring. This spring is the subject of great conflict amongst religious and mystical scholars. Every race in Azeroth claims that the spring waters were made divine for their people.
My final request of you: bring to me Holy Spring Water. Be warned. An expedition of naga explorers have advanced upon the spring. They will need to be dealt with as well.