Vodka

Vodka is a clear spirit that is relatively rare in RuneScape. It can only be obtained from Heckel Funch's in the Tree Gnome Stronghold, The Asp & Snake Bar at Pollnivneach, Jossik in the Lighthouse, and as an item given by one of the Knights of the Round Table during King's Ransom.

Uses
When consumed, Vodka raises strength by three levels at the expense of lowering attack by three. Drinking it is not advised since strength potions can provide a much larger boost without any side effects.

Vodka is used during Eadgar's Ruse. In the quest, players use vodka on the parrots' drinking water in Ardougne Zoo, along with Pineapple chunks. This is required to obtain a Drunk parrot, an item specific to the quest. When drunk, it temporarily increases the player's Strength level by 4, while decreasing Attack by the same amount.

Vodka is also used in the Gnome Restaurant activity, where it is used in some of the cocktails one can make during the activity:

Vodka