Copper water may help in the following :

Ayurvedic use of copper vessels dates back many old centuries, and it is the oldest example of practicing preventative natural health. It was observed that people who are drinking water from copper vessels tended to recover from an injury faster and more completely than expected.

Ancient Egyptians used copper vessels to keep water fresh. They had observed that copper was a good material for storing water, and realized the natural health benefits of drinking water stored in copper vessels.

Scientists have now discovered that copper ions can kill harmful bacteria, a capability not found in any other metals. It has a lot other benefits.