Smart Drinks
Collect 6 Wailing Essence from the ectoplasm creatures in the caverns.
Collect 6 Wailing Essence from the ectoplasm creatures in the caverns.

Both factions: Mebok Mizzyrix in The Barrens (62.4, 37.6).
Both factions: Mebok Mizzyrix in The Barrens (62.4, 37.6).
experience only, 2,650 XP.
Smart Drinks is a level 18 quest; you can pick it up from level 13. It takes you into Wailing Caverns.
All Wailing Caverns quests on one map ·Wailing Caverns dungeon guide
Sources: Quest data from ForeverDB.net · ForeverDB: Wailing Caverns · ForeverDB: Altered Beings · ForeverDB: Hamuul Runetotem · ForeverDB: Nara Wildmane · ForeverDB: Leaders of the Fang · ForeverDB: Deviate Hides · ForeverDB: Deviate Eradication · ForeverDB: Serpentbloom · ForeverDB: Raptor Horns · ForeverDB: Smart Drinks · ForeverDB: Trouble at the Docks · ForeverDB: The Glowing Shard · ForeverDB: In Nightmares (Horde) · ForeverDB: In Nightmares (Alliance)