In a large skillet on medium heat add the olive oil. Once hot, add the mushrooms, zucchini, garlic, and thyme. Cook, stirring often for about 5 minutes. Add the spaghetti and water, salt, and pepper. Bring to a boil and simmer for 10 minutes or until water is absorbed and pasta is tender. Stir in the parmesan and sprinkle with parsley. Serve.