Start with a clean glass container or medium glass bowl.
Stir together warm water, potato flakes, sugar and yeast.
Cover with a breathable tea towel or loose cling wrap that is slightly gaping.
Leave it at room temperature for 4 days, stirring daily.
On the 5th day, feed the starter with 1 cup warm water, 1/4 cup sugar and 3 tablespoons of instant potato flakes. Stir it well and allow it to sit at room temperature for 8 hours.
Remove 1 cup of the starter to make your bread. Place the remaining starter in the refrigerator.
Maintaining The Starter
Remove your starter from the refrigerator, and feed it with 1 cup of warm water, 1/4 cup sugar and 3 tablespoons of instant potato flakes.
Allow it to sit at room temperature for 6 hours, or until it looks bubbly and active.
Once bubbly, it can be used in bread recipes.
Keep stored in the refrigerator between uses and feed every 3-5 days