Aqua Vitae was the period term for simple distilled liquor such as whiskey or grain alcohol. It was typically used for medicinal purposes, but could be consumed as a recreational beverage. Being of enormously high alcohol content (as high as forty-percent) it was best consumed in small doses.
Aqua Vitae is Latin for water of life, which is comparable to the Gaelic roots of the word whiskey, "ou-skye", which also translates as water of life.
In the Kingdom of Ealdormere, "Aqua Vitae" is typically used as a synonym for Jagermeister, the brand name of a flavourful blend of grain alcohol and herbs held in high esteem by certain SCAdians.