Did you drink your water today? The recommendation is to drink about 2 liters a day (about eight 8-ounce glasses). Our bodies are pretty good at telling us what we need, so listen and drink when you are thirsty. I've noticed that when I haven't drank enough water for a couple of days my thirst goes away. So drink a couple of glasses of water every day, and then the body will tell you when it needs more.