When water is stored in a copper vessel or bottle, for eight hours more, copper releases some of its ions in the water, through a process called Oligodynamic effect. Copper is a known to have antimicrobial, anti-inflammatory, anti-carcinogenic and antioxidant properties. It assists in the formation of hemoglobin as well as cell regeneration and unfortunately, the human body cannot create the trace amounts of copper it requires to function healthily, therefore, copper has to be a part of our intake either through food or water, but the human body is benefitted in several other ways with the presence of copper,
 
Helps the digestive system perform better
Aids weight loss
Helps heal wounds faster
Slows down ageing
Helps maintain heart health and beats hypertension
Mitigates the risk of cancer
Protects you from infections.
Regulates the working of the thyroid gland
Beats arthritis and inflamed joints
Boosts skin health and melanin production
 Beats anemia
 
A healthy human body requires trace amounts of copper to function effectively. Copper helps with generating heat in the human body, aiding communication between different cells, breaking down of certain foods to become hemoglobin and boost our metabolism. Copper deficiency leads health issues like anemia, parasitic infections and leaky gut to name a few. Foods rich in copper include sunflower seeds, lentils, dried apricots, mushrooms among others.
 
Do not refrigerate the cup. The best time to drink water stored in a copper cup, is on an empty stomach in the morning. Do not over do it, drinking water stored in a copper bottle cup twice a day (morning and evening) is more than enough to provide the necessary amount of copper to your body.
 
One must also remember that too much of a good thing could also become harmful, especially, if we are talking about the delicate balance of the human chemistry. Water makes 75% of our anatomy, however, one cannot keep on drinking water stored in copper vessel, all day and everyday. 
 
Take breaks from drinking water stored in a copper bottle. For example, take a month long break after regularly drinking water stored in a copper bottle for two months. This allows the body to flush out the extra copper.
 
Over time, your copper mugs are likely to develop tarnishes and patina because copper naturally reacts with oxygen in the air. If you want to revitalize the charming glow of your copper mugs, you can easily care for copper mugs:
Pure copper oxidizes when exposed to oxygen and liquids. The best way to clean a copper vessel is to scrub it with lemon juice or vinegar and salt, to remove the oxidation stains. 
 
How to clean your copper cup?
Lemon and Salt
For especially badly tarnished copper, you can use half a lemon and some ordinary table salt. This method involves some effort, but it is most effective for removing stubborn tarnish.
Pour some salt onto a plate (coarse salt if you are dealing with tough tarnish), dip the lemon half into the salt, and scrub the surface until you remove the tarnish. Finally, rinse with warm water and soap and dry the copper with a soft cloth.
 
White Vinegar and Salt
Dissolve 1 ½ teaspoons of salt in 1 cup of white vinegar. You can put this mixture in a spray bottle or apply the mixture with a soft cloth. Once applied, leave it to take effect for around 30 minutes and rinse and dry. If there is more tarnish present, repeat the process, and if there are dents holding any grime, use a soft toothbrush to gently scrub the copper.
 
According to the World Health Organization "there is greater risk of health effects from deficiency of copper intake than from excess copper intake."