Go to the garden center in San Ramon or where ever you are in the Bay Area. get some seed starter mix. Mix that with your garden soil. For now dump out as much water as you can. Flip your container over onto a plate or paper towels. Dry out the container. Put a layer of dry soil on the bottom. Drain off as much water as you can from the mess on the plate or paper towels. Then put that back in your container. Try to cover it with another dry layer. Then wait a day and mix it up a little. It should be dryer. This would be a good time to split the culture into 2 containers. If you drown one you have a back up.