Acquire skins of Smolderhide Firewater from the furbolg camp in Val'sharah. Bring them back to Deucus Valdera in Dalaran so he can make use of the corks.
Oh! I recognize these corks you brought me, <name>. I recently acquired several from a furbolg tribe in Val'sharah. They need sturdy corks to keep a tight seal on that potent firewater they brew.
We need more firewater potions--the corks would make an ideal addition to our alchemy table!