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.
Carbonated or sparkling water may be water that naturally contains carbonation or has had carbon dioxide added to give it fizz. Water flavored with a hint of natural fruit essence is still considered bottled water. Products that contain sodium, sugar or artificial additives are considered soft drinks. For example, club soda and seltzer are considered soft drinks because sugar and sodium are added.