I had people visiting from Greece, Poland and Spain asking me if my tap water (Berlin) was safe to drink. You don't have to go to uncivilized parts of the world to get bad tap water.
There are different levels of "safe".
For example, in London it's "safe" to drink tap water, it does not contain toxic checmicals of bacteria, but it is calcium rich, and drinking it constantly may be harmful for kidneys.
That's what water softeners are for.
Unfortunately public taps/fountains seem to be far more rare than drink vending machines in this world of ours.