Water is basic for humans. Water means that it can be easily broken down into O2 and H. The hydrogen can be used as rocket fuel, and the Oxygen for breathing.
It means that the weight used in a vehicle for fuel to go to Mars was just cut in half.
If you are interested in exploring our solar system, this is a BIG deal.
Actually, I don't think so... Maybe the weight of the vehicle returning from Mars but not the one going to Mars.