PURCHASE, NY— Mary Reinemund, wife of Pepsico CEO Steven S. Reinemund, passive-aggressively buys Coca-Cola products whenever she is angry at her husband. "Last Wednesday, Steve worked late on their anniversary," said Bea Vance, the Reinemunds' housekeeper. "Sure enough, the next day, there's a two-liter bottle of Diet Coke in the fridge." Vance added that in the summer of 1999, during "an especially rough time" in the Reinemunds' marriage, Mary was often seen wearing a promotional Sprite sun visor.