When Lifeway Foods Inc. purchased the former Golden Guernsey fluid milk plant in Waukesha, Wis., at a bankruptcy auction in 2013, it faced an uphill battle in readying it for production of the company’s signature 32-ounce kefir line. Although the 157,000-square-foot, 60-plus-year-old facility had “good bones,” its former tenant had shut down very quickly with no exit plan.