SNAPPLES R US: A man-on-the-street imagines a store devoted solely to Diet Snapple in a new spot for the Quaker Oats Co. brand. The wry tone of the estimated $10 million to $15 million campaign from Foote, Cone & Belding, Chicago, is reminiscent of early Snapple ads. In "Diet Snapple Town," aisles are assigned to different flavors and a register takes the "Diet Snapple Preferred Shoppers Card." Creative director: Tom O'Keefe. Art director: Matt Reinhard.