This Water Tastes Funny

This Water Tastes Funny is a side quest in Dragon Age: Inquisition.
 * Griffon Wing's well has been tampered with and cannot support the keep. An alternative source of fresh water must be secured. A nearby oasis called Lost Wash Creek would do, if it wasn't crawling with Varghests.

Acquisition
The quest is acquired by talking to Knight-Captain Rylen after claiming Griffon Wing Keep.