Sailors mixed rum and water, the rum killed off some of the pathogens, the water was very dirty and sometimes months old from their last port call. Water in some cities in China is so bad there is an oil slick on the surface when you put some in a glass. It's simply not safe to drink that trash, their standards are very low, much lower than ours, which I think are too low.

Harold MacDonald wrote:
Many many long moons ago when tea became popular in Great Britain there was a significant drop in mortality,why you may ask,because polluted water had to be boiled to make the tea;simple,n'est pas? Harold