"If it is so dangerous, why are the millions of people that grew...

"If it is so dangerous, why are the millions of people that grew up on 'drinking rain water' still alive??"
As a matter of interest I was brought up drinking rain water.

I didnt say it was so dangerous but now that you mention it. If it so safe, why this........?

"between 34 and 76 million people will perish from water related
diseases by 2020. This problem is one of the most serious public health crisis​

facing us, and deserves far more attention and resources than it has received so far."
Wow this is scarier than I thought!

and just so Im not found guilty of scare tactics........

http://pacinst.org/app/uploads/2013/02/water_related_deaths_report3.pdf
and there are reams of info out there.

And from the World health organisation.......
"Contaminated water can transmit diseases such diarrhoea, cholera, dysentery, typhoid and polio. Contaminated drinking-water is estimated to cause 502 000 diarrhoeal deaths each year."

"Make that STORY singular"
Being as you are being picky.........
There was a story of mice (plural) and a goanna That makes two possibly three.
If you are going to try and belittle someone for sharing knowledge then at least get your rhetoric correct.