Homemade sourdough bread a boon for preppers

(Natural News) Sourdough bread is delicious, but if you love sourdough, you can learn how to make a sourdough starter, so you can bake it at home instead of buying it at a bakery. To make a sourdough starter, you only need four ingredients: flour, active dry yeast, sugar and water. (h/t to JustPlainCooking.ca) What is sourdough?…