I would flush only with distilled water. It doesn't seem like a great idea to introduce more foreign particles from tap water into a system you are trying to flush. When I replaced my WP and Thermostat, I flushed with 8-10 gallons of distilled water. The system is about 5 gallons, so that is about 2 full flushes. I would check the color of the water, you may decide extra flushes make sense.
If you are really concerned about flushing as much as possible out, you could drain from multiple points, instead of from just the coolant drain plug. That would entail accessing the front radiator hoses, in addition to just the drain plug.
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1999 Ocean Blue Metallic Boxster - blueboxster.com
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