Soap will not suds in hard water and clothes will not get clean. Hard water leaves a drying mineral residue on skin. Ground water just sits in the ground, gathering whatever minerals and pollutants are in the vicinity. Ground water usually needs to be purified or filtered. Most ground water is alkaline in pH. Surface water , such as a lake or river is usually not suitable for either drinking or skin application because of the high content of bacteria, micro-organisms, organic matter and pollution.
Distilled water is essentially dead and of little benefit to body, skin or eyes.