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Preheat oven to 375F (190C).
Stir marinara sauce, tomatoes, water, and rice together in a 13-inch by 9-inch baking dish. Add meatballs and stir to combine.
Cover the baking dish tightly with a lid or foil.
Bake for 60-75 minutes or until the rice is tender. During the final 5 minutes of cooking, remove dish from oven, uncover, and sprinkle with mozzarella and Parmesan. Place back in the oven (uncovered) for the final 5 minutes, or until cheese is melted.
Garnish with parsley just before serving.