Add 10 ounces of water and 1 1/4 cup of flour to replenish Sourdough Starter. Leave out for 5 hours. Measure out what's needed, then stick the rest in fridge. I don't do this. I just make 2 loaves, that uses most of the starter.
Notes
Substitutions
Gluten: Gluten is a protein found in specific grains (wheat, spelt, kamut, barley, rye). Other grains are naturally gluten-free but may have cross-contact with gluten-containing grains. Look for certified gluten-free products if you need to avoid gluten. Find out more about wheat and gluten substitutions.