- "This is an ordinary-looking, stoppered flask that somehow holds an endless supply of water. It might be useful for putting out fires or some such task."
The Decanter of Endless Water is a quest item in Planescape: Torment.
Its first use is to free Glyve in the Weeping Stone Catacombs. After, he reveals that there is a woman named Nemelle who knows how to unlock the decanter's full potential.
After learning the command word for the decanter, it can be used to unleash Ignus, allowing him to be recruited.
As described by Chad in the Weeping Stone Catacombs, the decanter can be found in the Drowned Nations (X=3700 Y=1275).