Cut squash in half lengthwise, top to bottom, and use a large spoon to remove and discard the seeds. *See notes.
Pour the water into a casserole dish and add the squash, flat side down.
Cover the dish tightly with plastic wrap and microwave 6-10 minutes or until the squash is easily pierced through the skin with a fork.
Remove from microwave, carefully remove plastic wrap and immediately flip the squash over (or it will overcook).
Run a fork along the strands to separate. Season with butter, salt and pepper.
Notes
*If the squash is difficult to cut, poke it with a fork all over and microwave it for 3-4 minutes before cutting it in half.Leftovers will keep in the refrigerator for 4 days and in the freezer for 6 months.