About warm water, i will put a piece of text trough google translator written on the website of our countries main water supply, one of the best quality drinking water in the world.
"Can I drink hot tap water?
As a water company, we do not recommend drinking hot water from the tap. It is possible that metals from the pipes or the boiler or water heater in warm water. This applies to both old and new pipes. Also there remains a chance that metals like copper, lead and cadmium dissolve in warm water.
But you can drink hot water from the tap to get cooked. A cup of boiled tap water or boiled water that has cooled, are no problem."
My bad about the bacteria, remembered it wasnt all healthy tho