How do I unlock more ingredients?

Ingredients will automatically unlock for you as you play the game. This reflects your growing experience as a brewer. The most obvious ways to unlock ingredients are for example... to unlock different types of malt, harvest more barley.... and to unlock different types of hops, harvest hops! Some of the other unlocks are a little less obvious and we'll leave it to you to discover them. Keep this rule of thumb in mind though for this part of the game... the more you interact with other brewers the more experience you will gain as a brewer and the more resources you will discover and learn how to use.