Cook sausage links according to package directions; drain, cut into 1/4-inch slices. In a large bowl, combine sausage slices, pasta, pasta sauce, water, basil, garlic, Parmesan cheese, pepper and mix well. Spoon mixture into a greased 9-in. x 13-in. x 2-in. baking dish. Arrange garlic bread slices on top of meat mixture. Sprinkle evenly with mozzarella cheese. In a small bowl, dip tomato slices into olive oil. Place one slice of tomato on each piece of bread. Bake uncovered, at 400°F for 25-30 minutes or until heated through. Remove from oven and let rest for 5 minutes before serving. Garnish with basil leaves. Serve.