Four families in Yoder are building a sand bunker and stockpiling ammunition and weapons. A Black Forest resident has erected a geodesic dome on her 5-acre spread to grow vegetables, keeps horses for emergency transportation, in case she can't get gasoline for her car, and plans to acquire chickens and goats as food sources. A husband and wife who have a cabin on 100 acres of secluded land in Park County have weaned their property from the electric grid, acquired a three-year food supply and taken other measures to become self-sufficient.