By Chelsea Wooton Courtesy photo: A historic Quality Dairy Co. storefront in Lansing, where generations of families have shopped for fresh dairy and hometown favorites. There are convenience stores, and then there is Quality Dairy Company, a place where “running in for milk” often turns into donuts, chip dip, ice cream, and small-town rituals. As Lansing’s hometown institution approaches its 90th anniversary on March 11, Quality Dairy doesn’t feel old. It feels seasoned — refined over...