That's the point of the article. Drinking water is from bottled water. Hot beverages are from the 'tap' water, and the requirements on the tap water are not as strict as the drinking water.
I assume that this is a just alarmist journalism, since water for tea/coffee is heated to boiling, and all the taps in the bathrooms say some version of 'non-potable'.
I assume that this is a just alarmist journalism, since water for tea/coffee is heated to boiling, and all the taps in the bathrooms say some version of 'non-potable'.