The answer is yes and no
WHY IT WORKS
If you are dehydrated and not getting the sufficient amount of water it is likely that you will have tight, dry, flaky skin.
WHY IT DOESNT WORK
According to leading dermatologist external factors influence skin dryness more than internal factors. What dry skin needs the most is products that help to reduce trans-epidermal water loss. Unfortunately drinking water has no effect on the water loss. There are, however, certain products that will.
A good moisturizer is the best solution with instant results to improve the look and feel of dry skin. Good moisturizers should draw moisture from the dermis to the epidermis and seal in moisture and protect the skin. Both African Black Soap and Shea Butter has the properties necessary to protect and hydrate skin leaving it softer, smoother and more supple than before.