The universe is just so unfathomably big that there has to be tons of everything out there.. Water, simple organisms, highly intelligent creatures... The universe is just too vast for us to be the only thing in it...
There was dinosaurs before us, so it's no stretch to think stuff like that can't exist elsewhere
But we will likely need to go through tens of thousands of star systems and past thousands of light years before we find another civilization.
They are almost certainly out there, probably even somewhere in our own galaxy, but they are so far away, and so few and far between that we may never be able to contact them.
The distances are mind-boggling. It takes light tens of thousands of years to cross our galaxy. It takes light millions of years to travel to M-33 or M-31, the two nearest large galaxies.
Sci-fi is a lot of fun, but reality is very different then those movies.
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