You have no idea what is in the tap water, so stop telling everyone to drink it. What do you know about the piping in your apartment? Perhaps one of the builders didn't caulk it correctly and now some of the caulking is leaking into the water. Maybe there is a section of pipe that was sealed with glue by an untrained plumber and now you have traces of adhesive coming out of your tap. My point is that you - Molten Metal - do not and cannot know what is in the tap water. Use your brain for a change. Stop trying to argue that ignoring problems is the secret to fixing them.