4 days from the start. Just flour and water. I didn't buy anything but the flour. I mixed them up, brought it outside for a bit to catch some wild bacteria a

4 days from the start. Just flour and water. I didn't buy anything but the flour. I mixed them up, brought it outside for a bit to catch some wild bacteria and yeasts, and I've been stirring it periodically. I put it in the oven with the light on a few times to speed things up. Every day I add a bit more flour and water. It currently smells like yogurt and is full of small bubbles. I think it should be ready to use in another 2-3 days.