Put all the ingredients in a jar that has been sterlized in boiling water, close the lid, and just leave it alone. Don't mix with a spoon as this will introduce unwanted microorganisms. Just shake lightly.
On the second day it'll start to bubble. If you leave it in a warm place it will ferment faster. After a day or two once it has become very bubbly it's complete. ※ Open the lid once a day and shake the jar around.
If it foams up vigorously it's complete! When you open the lid you should hear the sound of air escaping with a whoosing sound
Once your starter is complete, store it in the refrigerator.
Check out this simple bread recipe - Recipe ID: 387724
Story Behind this Recipe
When I was making a raisin bread starter, I learned that I could make starter using all kinds of ingredients.
Yogurt ferments quickly. In the summer this can be made in a day. It can be stored for about 2 months, but try to use it up quickly. Starter can be used in cooking as well as for bread, so try experimenting.