And drained Blend tomato sauce, spaghetti sauce mix, and 1.5 cup water. Simmer, uncovered for 10-12 minutes. Meanwhile, combine 1 cup mozzarella, cottage cheese, and Parmesan. Add eggs, parsley, salt, and pepper; mix lightly. Stuff manicotti shells with cheese mixture, using about quarter cup for each. Pour half cup of sauce mixture in to dozen x 7.5 x 5 cm baking dish. Arrange manicotti in dish; pour remaining sauce atop. Sprinkle with remaining mozzarella. Bake uncovered at 350 until bubbly, 25-30 minutes.