According to WHO the upper daily limit of copper consumption for and adult is 10,000 mcg. 1 litre of water stored in a copper vessel for over 5 hours absorbs around 500 mcg. Don’t worry you are safe as long as you drink less than 20 litres in a day. Fill your copper vessel and leave overnight. First thing in the morning drink as much as you can. According to Ayurveda, this practice helps cleanse the digestive system. Do not leave water in your copper vessel for over 15 hours.After that you can refill and use your vessel through the day just like any other water container.