Combine ½ cup water and ¼ cup unbleached all-purpose flour in a glass jar. Mix well. The mixture will be thick.
No nothing. Relax!
Notice a dark liquid (hooch) on top. This smell is normal. Scoop out half the mixture and discard or use for recipes. Add ½ cup flour and ¼ cup water. Stir well.
Repeat feeding process daily. Discard half the mixture, then add ½ cup flour and ¼ cup water. Stir well.
Starter should be bubbly, double in size, and fluffy. If not, continue feeding until ready.
Once ready, transfer starter to a fresh jar.