With the vitamin question, the key point is a balanced diet. If you are not on a balanced diet, you need to ask yourself why not?
Bottled water needs to be transported to you from a bottling plant. There's carbon costs associated with the transportation across states and even across countries/continents.
Bottling plants are notorious for their ineffeciences and competes with local plantations for precious water resources.
If you are in a developed country, tap water is as safe and cheaper and kinder to the environment as compared to bottled water.
Han Solo