Any restaurant has two basic jobs. In the kitchen, it?s washing dishes. In the dining room, it?s pouring water. Ari Weinzweig has turned one of those jobs ? waterboy ? into his strategic weapon. Even though he?s the co-founder of Zingerman?s, the , Mich., food empire, you?ll find him most nights at Zingerman?s Roadhouse, refilling ...