I think it's personal preference....my sister in law who was born here has never drank the tap water, she won't even use it for making coffee. I do know there's a lot of chlorine in the water, just step into a hot shower and you can smell the chlorine and even just running the tap water I can smell it.
If we have run out of bottled, Eco is the best here IMO, as there is no salt in it, I have just brought a pot to boil for about 10 minutes or so, tastes okay, but I still prefer Eco.