You will know the benefits of copper vessels if you happen to be in the Yoga and / or Ayurveda line. Alternatively, if you have had Indian traditional upbringing, you will also be aware that drinking water from copper vessels is important.
I spent my younger days with my great grandmother, grandmother and all the elders. In those days (that is in late 1970s), silver ware and copper ware were the most used by Indian families. The elders in my family taught me the benefits of drinking water from copper vessels and eating from either copper or silver wares. Come to think about it right now, those days glass wares were not common and so was plastic wares too. The most common types of plates and utensils were usually made of copper, silver or wood.
As days passed and modernization took place, Pyrex glassware were the trend and so was forgotten the copper and silver wares. Nowadays, I try to make changes to my daily life based on what I learnt in my younger days. One of the many things that my elders taught was to drink water early in the morning out of a copper cup/mug. I re-started with that practice and I should say it rather makes a slight difference to my body systems. Benefits are not major and visible immediately. As with any healthy changes to food and lifestyle, the results will be visible or experienced slowly. The results I experienced was a better “feel” of the inner systems mainly in the digestive system. Other results are not visible to me, but I do believe it does well for my body systems one way or another.
While Indian elders and traditions tells of benefits of drinking water from copper, there are always reports contradicting that. I am not here to debate which theory is correct. I am sharing what I have learnt in my younger days and a practice I am putting back into my life and influencing my family members at the same time too. Moreover, drinking water once in the morning from a copper cup is not much work or something to debate about. It all comes down to how much you believe and trust what has been said (or learnt) or passed down from generations.
Below are some articles on drinking water from copper cups:
From YogaDigest.com: 6 REASONS TO TRY A COPPER WATER VESSEL
From OneWorldAyurveda.com: Health Benefits of Drinking Water in Copper Vessel
From Wholesome Ayurveda.com: Correct Way To Drink Water From Copper Vessels And Its Health Benefits
From Vasantihealth.com: Are You Using Your Ayurveda Copper Water Vessel Correctly?
From Today.com: Drinking from a copper cup: Good for health or the latest health fad?
From DrCopper.in: Various Information such as cleaning, benefits, etc