It might not seem as interesting as the recent delivery of the new room and viewing dome to the ISS by the shuttle Endeavor, but another arguably more important task accomplished by the shuttle crew was the rejuvenation of the water recovery system on board the space station, with the distillation assembly being refurbished and the fluids control pump assembly replaced.

And so what you might be saying?! 

Well the significance is that our bodies consist roughly of two thirds water and thus a continual intake is vital for survival. You could live on average between 3 to 7 days without water (depending on environment) but as little as a 10% fluid loss is likely to prove fatal if not treated immediately.