Can H2O Form Without an Atmosphere?

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Can H2O form without an atmosphere?
 
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Define "form", define "without an atmosphere" - while it may seem obvious to you what you mean, question is very ambiguous.

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Herkeybird said:
Can H2O form without an atmosphere?

Well, there's a lot of interstellar water, most of which probably formed out there in space (novae? supernovae?) That's the likely source for much of the early water on Earth: ice comets raining down upon Earth (as opposed to stuff 'outgassing' out of the Earth's core). Unfortunately, I can't find a good source for this last assertion, beyond what I remember and the Wikipedia article:
http://en.wikipedia.org/wiki/History_of_the_Earth#Origin_of_the_oceans_and_atmosphere