In an infinite universe, the likelihood is life that we would not recognise as life probably exists. But because Earth is the only planet to have life, which requires water to survive it's the only way we can search... The search is already looking for a needle in a haystack, but searching for life in a form we have no understanding of is like asking you to search for the needle in a haystack but actually it's not a needle, and I'm not going to tell you what it is or what it looks like.
We are starting to find or think there is water all over our solar system:
Oceans on: europa, enceledus, ganymede
Water potentially on: ceres, callisto, mars, dione, titan, pluto, charon.
Not enough data but they think maybe: Mimas, triton, titania, oberan, umbriel, tethys, rhea, lapetus.
We know theres some water on poles of mercury. Water vapour has been spotted high in atmosphere of neptune and uranus.
It just goes to show theres so much we dont know about our solar system. Also its potentially great for us, as we need places with some form of water, so we can build bases for jumping off points for exploration.
Im looking forward to the mission to neptune, not sure if NASA confirmed it. I think if its timed right they can get a flyby of Uranus on the way to Neptune. Seeing how much new data Pluto yielded, getting up to date data and pictures of Uranus and Neptune and some of their moons would be so cool.