THIS IDEA IS MEANT TO BE USED WHERE RELIABLE TRADE WINDS ARE NOTED TO BE MAINLY IN ONE DIRECTION.

By using solar power we can operate pumps to pump cold water either from ocean or contaminated under ground source. The water is pumped into water cooled condensers that are set up as fences (pipes with aluminium fins) down wind from solar heat collectors. After flowing through the condensers the water(slightly warmer now) moves up-wind through pipes painted black that run half pipes (parabolic heat effect ) to parabolic dish that concentrates heat to a coiled black pipe that super heats the water to steam where it is released into the trade wind which blows the humid air back to the condensers (down-wind) where the pure water drips into trough then to pipe  to fresh water reservoir.

Note... Wind mills can also be used to aid in pumping or in the case of no wind, to electrically fan air towards condensers.  Winds can be funnelled to condensers using land scape .Use gravity and siffoning effects. Consult physics engineers. Use a sun tracker to maximize sun's effects. This idea can work where ever hot sun and unpleasant water is available.