Mix equal parts flour and water in a clean jar or bowl
Stir until no dry flour remains
Cover loosely with a lid or cloth
Leave at room temperature for 24 hours
Discard half of the mixture
Add equal parts flour and water again
Stir well and cover loosely
Repeat feeding once or twice daily
Keep the mixture warm and at room temperature
Continue until it becomes bubbly and rises predictably
Use the starter dough when it smells pleasantly tangy and is active