Depends on what you're after. Many people prefer the cleaner taste of bottled water, and say they are able to drink more water since it tastes better. Bottled water is also portable, and easy to carry in the car or to a meeting. But some nutrition experts warn that bottled water, though convenient, does not contain fluoride.
Tap water is fluoridated to help prevent tooth decay.
If you drink water without fluoride, you may need to use fluoridated toothpaste or get topical fluoride treatments from your dentist. Mineral water must contain naturally present minerals at a concentration greater than 250 parts per million. Mineral water cannot be obtained from a municipal water system. Purified water may originate from either tap or ground water and is processed to remove minerals and impurities. Some companies add minerals back to the water to give it flavor.