You still have to pay for it because it costs money to make. But it’s completely open-source beer so you can recreate it yourself if you don’t want to buy it pre-made, or you want to modify the recipe.
I have no idea how to make beer otherwise I’d have a crack at this shitpost myself…
How to Make Your Own Beer
Yeah the source code has been published since the Egyptians
https://passtheflamingo.com/2017/03/29/ancient-recipe-egyptian-beer-egypt-ca-5000-bce/
Mead is easier and JAOM is probably the most approachable one.