Mix equal parts flour and water in a clean jar
Use about 50 g flour and 50 g water
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 after each feeding
Repeat feeding every 24 hours
Keep the starter in a warm spot
Continue until it becomes bubbly and rises predictably
Use when it doubles in size within a few hours after feeding