None, sadly, or very little... sometimes I'll fill up a HUGE glass and drink it because I'm so thirsty and its close to bedtime and I don't want/need the caffeine keeping me awake... but otherwise... I hate water. I hate the taste. And yes I know water is "tasteless" but any avid water drinkers know that yes, it DOES have a taste! I hate tap, I hate bottled, culligan water is probably the one thing I can stand to drink without being forced to, and my inlaws DO have a reverse osmosis filter on their sink I don't mind drinking out of. But on the whole, I stick to soda, tea, lemonade, juice... HJ always tells me how dehydrated I am and I'll drink a big glass but otherwise I can't stand it