Any water on Pluto would be frozen as rock hard ice.
Spectroscopic analysis of Pluto's surface reveals the surface to be composed of more than 98 percent nitrogen ice, with traces of methane and carbon. One theory has it that there is a thick layer of water ice beneath the nitrogen ice, but because it is so far out, the composition beneath the surface is currently unknown. Speculation on its composition is based largely on what we know about its size and mass. The estimated density of Pluto suggests that water ice is a significant percentage of its mass which is what our rover is on a mission to find.
-Bekah
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