Water was changed

Khidr The Teacher of Moses called upon Mankind and announce on such
and such date all waters would be changed all over the world. Unless
hoarded all waters shall disappear. It would be later replaced with
new kind. Drinking of new water would make one insane.
Only one man listened to to it and he collected some water in jars and
kept it hidden.
On that certain date all water supply from streams river wells .. went
dry. This man of course did not have any concern since he had his
water supply while none had. When new water came through streams,
rivers and wells, all drank the same. This observed them from distance
and found they indeed gone crazy - behaving, doing, and talking
unbecoming of themselves. For some days he remained aloof and drank
from his own water supply till he realized that it is not much fun
being sane alone. He then abandoned his water supply and the new water
and became one of the insane. Others thought for no reason this acted real crazy but now he is one
of them, miraculously he is cured of his craziness. They thought no
more about this.