Combine 1 ½ cups water with spaghetti sauce in a bowl. Cover 13x9 inch baking dish with 1 ½ cups of sauce.

Arrange a layer of uncooked noodles, slightly overlapping, on top of sauce. Spread half the ricotta and half the mozzarella over noodles. Sprinkle with 2 tablespoons Parmesan. Add another layer of sauce. Repeat with another layer of noodles, the remaining ricotta and mozzarella and 2 tablespoons Parmesan. Top with a layer of noodles. Sprinkle with ¼ cup Parmesan. Cover tightly with heavy-duty foil. Set on a jelly-roll pan.

Bake in preheated 350-degree oven for 1 hour or until a knife goes easily through pasta. Let stand, covered, on rack 10 minutes.