Mix equal parts flour and water in a clean jar
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
Stir well and cover loosely
Repeat discarding and feeding every 24 hours
Keep the jar in a warm spot
Continue for 5 to 10 days
Use the starter when it is bubbly and doubles in size after feeding