Cook the beef in a 10-inch skillet over medium-high heat until well browned, stirring often to separate meat. Pour off any fat.
Stir the soup, salsa, water and tortillas in the skillet and heat to a boil. Reduce the heat to low. Cook for 5 minutes. Stir the beef mixture. Top with the cheese. Creamy Mexican Fiesta: Stir in 1/2 cup sour cream with the soup. Ranchero Style: Use corn tortillas instead of flour tortillas and shredded Mexican cheese blend instead of Cheddar. Serving Suggestion: Serve with a mixed green salad with Italian salad dressing and corn-on-the cob. For dessert serve with a store bought flan.