Seeing copper bottles all around was not enough now we have water purifiers exploiting popular public sentiment! The whatsapp tip! 
Drink water from copper bottle!
Drink water from copper bottle! Remember one thing: Whatsapp is not doctor. Don’t adapt tips blindly. Verify with experts! Although I take utmost care in sharing anything by discussing it with experts, experiments on self, don’t blindly follow my notes too!
See, we are living in extreme marketing age. Whatever is popular, will turn into business.
Coal and Salt became popular so they started adding it in toothpaste! And now we are happy consuming Ayurvedic Toothpaste (which is nothing by oxymoron)
Same is the case of copper! Keeping water in copper overnight and drinking 1 glass of it in morning is fine! But using copper for storing water for whole day! It is lunatic anti-health idea! Verify with any genuine Ayurvedacharya!
It is true that copper has capacity to keep water sterile from any pathogen attack but then it also changes water chemistry!
Stop using copper waters bottles if you are using it! Just restrict drinking water from copper glass in early morning as prescribed. No fancy blind experiments please!
Using plastic bottle is worse but then using copper is also not so good option! Find better solution!
How about silver for water?
There is seasonal switch prescribed. Silver vs Gold.