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Fresh water flushing using the low point drains, the water tank and pump and the city water connection until water runs clear should ensure your fresh water system is free of anti-freeze. Sanitizing with a little bleach at the beginning of each season is not a bad idea either. However, being a veteran of many business trips to Mexico and having suffered some occasional gastrointestinal gymnastics, I use bottled water for drinking and teeth brushing when hooked to campground water.