Plagued Spirit Bull Rat Liquor is a written note found in Death of the Outsider.
Transcript[]
1 grown bull rat (alive!)
9 red potatoes
3 drops of wormwood oil
Drain rat's blood into large cooking pot
Boil with potatoes on red hot stove
Add wormword when a mash forms
Strain the brew into copper vats with the rat corpse
Swelter one full moon cycle
Strain into a bottle WEAR A MASK OR YOU'LL PUKE!
Seal the rat inside with the liquor
(If Jeannette sees you steal a squiff, you'll be hound's meat.)
Location[]
This note can be found in a locked drawer by the entrance to the Albarca Baths during the mission One Last Fight.