The human body is 80 percent water, which means that is requires a constant intake to function properly. The general rule of thumb for drinking water is to consume eight 8-ounce glasses per day, which equals about half a gallon. Choosing the best type to drink helps maintain optimal health. With so many options on the market, how do you know where to begin? Understanding the difference between distilled and mineral water will help you make an educated decision about the kind that you put into your body.