There are a few ways to convert hard water to soft water for bathing. One way is to use a water softener. A water softener will remove the minerals from the water that make it hard. Another way is to use distilled water. Distilled water has had all of the minerals removed from it and will not cause your skin to feel dry or irritated like hard water can. You can also add a few drops of essential oil to your bathtub with the hard water to help offset any drying effects it may have on your skin.