Mix equal parts flour and water in a clean jar
Use about 50 g flour and 50 g water to start
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
Feed with equal parts flour and water again
Repeat discarding and feeding once or twice daily
Keep the starter in a warm spot
Use it when it becomes bubbly and doubles in size after feeding