You can also learn how to collect yeast. I make wine, beer and ultimately whiskey from wild yeast collection. Not sure how bread would come out though but it’s a thought.
Are there any special type of tools required to collect and incubate yeast? I think that was my only concern with trying to just keep cultures on hand, but if they can be procured without special equipment, then I'd go that route instead. Like can I just use common household items to collect and incubate?