In the desert, there are only two glasses of water. Which one do you drink?

In the desert, there are only two glasses of water. Which one do you drink?

I asked my friend a sharp turn and said, "You are alone in the desert. When I was dying of thirst, I drank two glasses of water, one cup of urine and one cup of poison. Which one do you drink? " The friend said without hesitation, "I drink urine." Then I didn't tell him the truth.