In many countries (like the UK) it's fine to drink tap water, but the bottled water companies have done an excellent job of brainwashing consumers to the contrary. Then Coca Cola had a massive
PR disaster when it was discovered that
Dasani had more toxins than tap water. I remember Perrier going through something similar in the 1980s, but despite this sales of bottled water have skyrocketed.
In the DR though, it is necessary to drink bottled water no matter what.