Water Water

Some days I am super thirsty. I sometimes drink three liters of water while at work, and then another one or two at home. And then some days I am not thirsty at all and trying to finish a single liter is a struggle. What's up with that?

Today is a thirsty day. Yay for water!

(from http://aunz.siemens.com/Water/Pages/CC_2097_Water.aspx)