Question:
Bottled water, is it better than tap water? Options

Answer: Traveler's Syndrome" is not just a story. It's plenty documented and tested. When you travel further from your home, you get exposed to bacteria and spoors that are different from those in your local area. The most common outcome of this is digestive upset. No water from anywhere is completely sterile or devoid of local bacteria unless you're drinking distilled water. This is completely normal and not something to be paranoid about.

But when you go to a place that's unfamiliar with strange bacteria your body might react badly to it until it adjusts. It doesn't happen to everyone, and it can impact people to differing degrees. So bringing bottled water that your body is adjusted to isn't completely unreasonable.