In Ayurveda, drinking water that has been stored in a copper vessel is particularly highly regarded because it tastes good and is said to have a purifying effect on the whole physiology, as well as having a specific balancing influence on Pitta dosha. In fact it is said to help balance all the three Doshas in your body: Vata, Pitta and Kapha.
Water stored overnight, for at least eight hours in a copper vessel, is known as Tamara Jal and should be drunk first thing in the morning.