Brown meat in large skillet on medium-high heat. Drain fat.
Stir in Seasoning Mix, water and beans (if desired). Bring to boil. Reduce heat to low; simmer 5 to 10 minutes or until liquid is absorbed, stirring occasionally.
Spoon meat mixture into tortillas. Add desired toppings, such as shredded lettuce, chopped tomatoes, chopped avocado, shredded cheese, salsa or sour cream. Fold over bottom and sides of each tortilla to serve.