Dear.. It is nice to take copper water because it has a huge role in improving the health of skin. It promotes melanin production.. But you should take about 100-200 ml of cu water in a day.. Not more than this. You are taking Tab. Pigmento you should also apply pigmento cream to the affected area and after applying that should give mild sun exposure to that affected part then only it is effective..if you are not getting relief then you can consult me in early stage it is possible to reverse the pathology..

Only take  one time copper water .early morning  empty stomach. Second  take copper water only in winters .because  nature of copper  is hot and it is good if you take in. Winter .

Drinking copper vessel water is fine.. But do drink it only 1 glass.. Not 2 ltr.. Use pigmento ointment also..

Consult ayurveda physician for proper diagnosis and root cause of ailment

Drinking water from copper vessels will boost your immunity. There is no harm in consuming water stored in copper vessels long term. For vitiligo you can undergo perioduc Panchakarma treatments as well to arrest progress of the condition.