“If you attend Oktoberfest in Munich, the only beer you’ll find during the festival is brewed within the city limits of Munich. Only beers that fit this criteria are considered Oktoberfest Beers. According to the Bavarian Purity Requirements there are only 3 ingredients used in the brewing process: water, barley and hops.”
I’d have to find the article somewhere deep in my browser history, but I read a really interesting thing about the 3 ingredients thing a while back. In the more distant past there was lots of experimenting with brews. Many more plants etc. some with very potent effects beyond typical alcohol. some medicinal stuff along with some real trippy stuff. Of course sometimes it went bad, and people got sick or worse, so rulers started to restrict all beers and fermented teas to just those 3 ingredients. Well in fact this basically would restrict all brewing to beer brewing in Europe – no more of that kombucha business.
Also brewing was typically a women’s role. A towns brew wife (like the animal husband) was the one who kept all the recipes and such. And herein lies part of the origin of the mythology of witches. Alas, I could not find the article in my browser history and I don’t feel like looking all this up for references.