There are creatures on THIS planet that could survive a journey through space. By that measure alone, I believe in life outside of this solar system.
What is water? It's two parts hydrogen (the most abundant element in the universe) and one part oxygen (more rare, but not overly so). How is it formed?
Do we really believe these circumstances are so rare that our entire universe has failed to produce more than one example of it?
There's some pretty loooooong odds on that...