Some of the tap water in smaller towns in the Canadian prairies tastes pretty bad and I might buy bottled water there, although I hate buying bottled water.
One of the Canadian brands, I forget which one, is Calgary tap water, filtered and bottled in a plant. Yet local people will buy it in preference to the tap water when it is the same thing!!
I like the idea of just adding something to change the taste a bit.
In Canada and the US, we are lucky that the vast majority of places has potable tap water. Most of the world is not so fortunate.