How much water does your body needs?

Mine is 1.5 liters according to the body mass I have. That is considering my height and weight. But that is too much for me especially when it's wet season but 1 liter for me during dry season is enough. I am not a water lover actually and I used to drink only when thirsty but over time I have changed.  Why? because I have discovered the wonders of water.  I have this back pains and drinking water relieves me. And one liter is enough for me.  You, how much water does your body needs?