Detailed Instructions: Given the background description of some cooking related query, summarize the question into a title
Problem:I am often making a basic leavened bread for some basic recipes, like naan, burek, focaccia, pizza, etc. However, I find that dry active yeast is prohibitively expensive, considering it is a self-replicating living organism. Is there a way to effectively create and store yeast for a reasonable period of time (~3 months) from a mother spore?
Solution:
How can I cultivate and store yeast?