In A Nonstick Skillet, Cook Beef And Onion Over Medium Heat Until Meat Is No Longer Pink; Drain. Stir In The Spaghetti Sauce, Water And Spaghetti; Bring To A Boil. Reduce Heat; Cover And Simmer For 20 Minutes Or Until Spaghetti Is Tender. Add Process Cheese; Stir Until Melted. Sprinkle With Parmesan Cheese.