1) Curing:
The earliest form of food preservation in history is perhaps the curing of various foods, particularly meat.
The process involves the dehydration of liquids...
In the Medieval period, people enjoyed drinking as much as we enjoy it today, and because they did not have water filters back then it was actually even more necessary to drink a brewed beverage.
In the Medieval period, every kingdom was at war, everyone was fighting against everyone and it was just a mess.
As technology developed a lot of things changed.