You absolutely don’t need to drink a gallon of water a day under all circumstances. You also certainly don’t need an RO filter in most places. Tap water can be

You absolutely don’t need to drink a gallon of water a day under all circumstances. You also certainly don’t need an RO filter in most places. Tap water can be a great source of some minerals, depending on location and a little fluoride is great for your teeth. What carcinogens are you worried about in average tap water?