Craftsman's Writ - Major Healing Potion (quest)

Objectives
Deliver 20 Major Healing Potions and the Craftsman's Writ - Major Healing Potion - to Packmaster Stonebruiser at Light's Hope Chapel in the Eastern Plaguelands.

Description
The bearer of this writ is entitled to payment in the form of an insignia of their choice upon completion of the contracted work order. Work Order AL-169110: 20 Major Healing Potions. All filled orders should be delivered to Packmaster Stonebruiser at Light's Hope Chapel in the Eastern Plaguelands. Contract is null and void if tampered with or damaged. -Dispatch Commander Metz, The Argent Dawn

Progress
Filling a work order, ?

Completion
Do you know what the troops on the front lines call these? Priests in a bottle...  "I'm your priest in a bott-le baby... you gotta drink me the right way..." What's the matter sonny? It's a very popular song around these parts.

Trivia
The singing part of the completion text resembles the lyrics of the hit song "Genie in a Bottle" by Christina Aguilera:
 * [...] I'm a genie in a bottle
 * You gotta rub me the right way [...]