Which is the first tastiest water in the world?

Usually the water a person grows up with. Different cities treat their water differently in order to clean it or to add chemicals considered beneficial. So, one city's water might be distasteful to a person who's grown up with differently treated water. So-called pure water, from creeks and streams and spas and bottled, might be considered better tasting, but properly-conducted tests have failed to prove this to be true. Marketing plays a huge role here, while city water suppliers aren't known for advertising the tastiness of their tap water.