Preheat oven to 350 degrees F (175 degrees C).
Place squash, cut sides down, in a 9×13 baking dish. Pour water into dish around squash halves.
Bake in the preheated oven until tender and easily pierced with a fork, about 1 1/2 hours. Carefully remove the skin with a fork; it should be very easy to remove. Top squash halves with butter and season with salt and pepper to taste.
To cook a large squash takes 90 minutes. If you have a smaller squash, adjust the baking time.
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