There should be a fill point on the exterior of the coach - the one you use to fill the fresh water tank.
Some coaches have an in-line point near the water pump whereby you can simply put antifreeze into the pipes and bypass the water tank, but perhaps your's does not have this feature.
Another method that is commonly used is to put air pressure (20psi or less) directly into the city water inlet by use of an air compressor, and open all of the faucets (one at a time) until air comes out. This does a pretty good job also.
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