People don't really realize how important water is. Or how important the nature of water is. There are several things about water that make it one of the most important substances in the universe.

For one, water is essential to life. The human body is 60-70% water. In order to survive you need to drink at least one to seven liters of water a day to avoid dehydration. In an environment with an average daily temperature of 60 degrees Fahrenheit you could only survive for 10 days without any water consumption.

Another important aspect of water is that when it is frozen (ice, dude) it floats. If it did not float then the world would be hella freaking hot. Ice reflects a lot of the suns heat back out into the great black yonder. On top of that it protects the ocean from becoming too hot. If ice were to sink then only the very depths of the ocean would be cold and the uper levels would be steaming. Life on our planet as we know it could not exist under these circumstances.

Water has an amazing ability to maintain its temperature. This is very important because it acts as a buffer system to changes in temperature. If water was not able to maintain its temperature as it does, our planets temperature would fluxuate far more often and in a more extreme manner.

Water is important. It is vital that we correct out water wasting ways as quickly as possible. Water is NOT an infinite resource. This is directly connected to global warming and pollution. If we don't clean up our act our species is fucked.

Look at this graphic of our solar system, a bigger version of which can be found here. The blue zone is the where a planet can have temperatures and all forms of water like ours can. LOOK AT HOW SMALL IT IS IN COMPARISON TO WHAT WE KNOW OF THE UNIVERSE. Not just the universe, only what we know of the universe. It's freaking tiny. Our planet is literally a perfect planet. It is in the perfect place, the perfect size, and it orbits perfectly around a perfectly sized star. That's a lot of perfect people. That's a lot of perfect that's hard to duplicate even in an infinite universe. Yeah, there are probably hundreds, maybe even thousands of other earths out there but we do not have the technology to get to them. And, at the rate we are going, we won't have the technology before we turn our big blue marble into a big brown graveyard for ourselves. This IS the only earth we got. STOP BEING IRRESPONSIBLE MESSY HUMANS!!