Apparently you can deep-fry Pepsi. This is one thing we learn from the press release for “Deep Deep Pepsi,” Anissa Mack’s third show with Laurel Gitlen. Printed mirrors, emblazoned with messages like “Deep Deep Deep,” “Deep Deep Pepsi” and “Deep Fried Pepsi,” echo a prized food at county fairs. This conceptual populism, with its seeming affirmation of lowbrow tastes, certainly points to Jeff Koons, whose work is even more explicitly referenced with the inflatable Mylar dolphins that float in small schools in the gallery’s front room, tethered to red helium tanks. Well, the elder artist did say he hoped his debut solo show at a New York museum, now on view at the Whitney, would initiate a dialogue with young artists.