A hundred years ago, in a different life, I used to service the potable water tanks. After three years???? in an aircraft, with periodic anti-bacterial flushes with a chlorine based powder, there was still a slime in the tank.
I know water is supposed to be safe to drink after boiling, but I would like to point out, especially to an earlier contributor, the coffee makers do NOT boil water, they only go to about 80 degrees. So don't think you are safe. Best take a bottle or have a coffee maker not connected to the water system - trouble is they make rotten tea - no boiled water.
I think it is time to go round the back for another brandy.