Royal Crown Malort
From Blaseball Wiki
Royal Crown Malort is the official drink of the Chicago Firefighters. It is also commonly referred to as "Butt's Special Stuff", as it is a triple combo of RC Cola, Malort, and hydrant water. It can only be drunk from a fire hose at full blast.
The Fire House has hoses strategically placed around the stadium. Whenever the Firefighters hit a home run, Royal Crown Malort is sprayed on the masses below in celebration.