Preheat oven to 375F. Brown ground beef; drain. Add water, Marinara sauce and salt. Bring to a boil. In 2 qt. oblong baking dish layer hot sauce, uncooked noodles, Ricotta and mozzarella cheese; repeat layers, ending with sauce. Cover tightly with foil and bake for one hour. Let stand 10 minutes before cutting. Garnish with Parmesan cheese.