Day 1-   Mix equal parts (in grams) water and whole wheat flour. (1/2 cup flour) (1/4 cup water).

Day 2-   Hopefully, you have some bubbles forming, if not, that is okay. Regardless, feed with the same amount of flour and water you used the first time, only this time using all-purpose flour (1/2 cup flour) (1/4 cup water).

Day 3-   Throw away half of the starter and feed with the same amount of flour, using AP flour, and water you started with. (1/2 flour) (1/4 cup water).

Day 4-   Discard half of the starter and replace with the same amount of flour and water you started with, using AP flour. Repeat this step each day until your starter has doubled in size and is full of big and small, beautiful bubbles. There should not be any unpleasant smell, such as acetone. The texture should be spongy.