I'm currently in snowy mountains at Cooma and have rented a cabin, I just realised that the hot tap water is spewing out mucky white mily water that just does not go away, it's not air bubbles but something else in it? Any idea if its dangerious to shower with it or drink it?
Just to be safe, you'll need to have a cold shower :-)
More seriously, the only way you're likely to get rid of the "mucky" water is to flush it out by opening all the hot water taps until they run clean. That will also run the hot water out, so no shower today.