Chef John's Sourdough Bread
If you don't have a banneton, you can simply line a similarly sized bowl with a tightly woven cotton kitchen towel and generously coat it with rice flour. I've done that before, and it works exactly the same. The only difference is the wooden basket "breathes," unlike a metal bowl, but I don't think that's a huge deal.
Here's how to make Chef John's Sourdough Starter. Plan ahead, because it takes 10 days to make.