Rot gut

Rot gut is a consumable item in Fallout 2 and Fallout Tactics.

Fallout 2

 * Can be found in Gecko, the Spittoon in Vault City, and the bar in Broken Hills.
 * Carried by the super mutant drunkard Elmo.
 * If John Cassidy, the bartender, joins one's party, he may have this in his inventory.
 * Can be bought from the hermit special encounter.

Fallout Tactics

 * Found in Freeport next to the alcohol still.

Behind the scenes
Rot gut is mentioned in Fallout 4 promotional items/The Vault Dweller's Official Cookbook.