Add 1 cup white whole wheat flour and 1 cup lukewarm water to a large plastic/glass mixing bowl. Stir together with a plastic spatula or whisk until fully incorporated, scraping down the sides of the bowl. Cover loosely with plastic wrap, a clean dish towel, or the lid to the bowl, being sure to leave space for air to travel inside. Set aside on a kitchen counter.
Day 2
Twenty-four hours later, add 1 cup all purpose flour and 1/2 cup lukewarm water to the starter. Mix together to fully incorporate. Cover loosely and set aside.
Day 3
Twenty-four hours later, again add 1 cup all purpose flour and 1/2 cup lukewarm water to the starter. Mix together to fully incorporate. Cover loosely and set aside.
Day 4
Twenty-four hours later, again add 1 cup all purpose flour and 1/2 cup lukewarm water to the starter. Mix together to fully incorporate. Cover loosely and set aside.
Day 5
Twenty-four hours later, again add 1 cup all purpose flour and 1/2 cup lukewarm water to the starter. Mix together to fully incorporate. Cover loosely and set aside.
Day 51/2
About 12 hours later, your starter should be ready for use. Remove 1 1/2 cups and store in a glass jar with a lid. Use the remainder to bake a loaf of sourdough bread or some other delicious sourdough treat. Enjoy!
If you plan to use your starter often, store at room temperature, with lid ajar, and continue feeding it daily by dumping/using 1 cup of starter and then feeding it 1 cup all purpose flour and 1/2 cup lukewarm water.
If you don't plan to use it as often, store in the refrigerator and feed weekly by pulling the starter out of the fridge and feeding it 1 cup all purpose flour and 1/2 cup lukewarm water. Have it sit at room temperature until bubbles form and grow (about 6-12 hours). Use 1 cup of the starter or dump it and place back in the refrigerator.
Every time you use 1 cup of your starter, feed it 1 cup all purpose flour and 1/2 cup lukewarm water.