1In 10-inch skillet, cook beef over medium heat 8 to 10 minutes, stirring occasionally, until thoroughly cooked; drain.
2Add taco seasoning mix and water to beef; stir until combined. Heat to boiling; reduce heat. Simmer 3 minutes, stirring frequently. Stir in soup; heat until hot.
3Spoon beef mixture into heated taco shells. Serve with desired toppings.