Mix 50 g whole wheat flour with 50 g 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
Add 50 g flour and 50 g water
Stir well and cover loosely again
Repeat feeding every 24 hours
Keep discarding half before each feeding
Continue until the starter becomes bubbly and doubles in size after feeding
Use when it smells pleasantly sour and is active
Feed more often if the room is warm
Use equal parts flour and water by weight for each feeding
Store in the refrigerator once established if not using daily