Is it good if i drink 500 ml of tea everyday?

Probably OK: Green Tea may have more health benefits than black tea. Herbal Tea is fine too. For the healthiest way to drink tea you should minimize the amount of sweetener in it because the health risks of using sugar and other sweeteners offsets the potential health benefits of tea. For more information on tea see this link: http://www.med.umich.edu/umim/food-pyramid/tea.htm