by 
The Curious Bag
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<h4 class="dechead">On One Hand: Copper Cups Have Been Used for Thousands of Years
While copper tarnishes in the air, it doesn't react readily with fresh water, the basis of nearly all drinkable fluids. This is why copper was formerly used for plumbing and still is in some cases. If the surface is tarnished, it's possible for a very low concentration of copper ions to dissolve into water. However, copper is more beneficial than otherwise: in such low concentrations, it acts as a bactericide and fungicide and has been used as such since ancient times.
On the Other: Copper Can Be Dangerous to Some People
Just to be on the safe side, some researchers recommend avoiding the use of copper cups when drinking acidic beverages. This is particularly the case for victims of Wilson's disease, a rare genetic disorder in which copper builds up in the victim's tissues, causing acute copper poisoning.
Bottom Line
For the vast majority of us, copper cups are perfectly safe. You should avoid them, however, if you know or suspect you have Wilson's disease.
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