What happens if you want to follow a bee to the hive, steal the honey, then make mead if you have no yeast wood?
What if you make acorn flour, removing the tannins and all, add wild berry jam to it, then want to make the yeast rise the flour/jam into a bread/cake/biscuit/etc?
Where will you get your yeast? Just wait for it? For days to infect it hoping that nothing bad like a bear comes along?
Sounds like you hate breads and mead.