coz what they are luking for actually is life....and water is the source of all life !
Also they would want to relocate people from earth, so a human would require water and air to stay for longer durations.
I think here they have taken a big assumption that there can not be any life without water.. So essentially human beings might not live (again a assumption) without water but there could be species who can live without it !
Human beings ka its sure, after alcohol they need loads of water to save from dehydration ;-)Source: http://www.healthy-water-best-filters.com/alcohol-dehydration.html
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