Answer
Boiling the water of the solution and condensing it in another vessel would be best.
Work Step by Step
There's a big difference in volatility between NaCl and water: they have boiling points of 1413°C and 100° C, respectively, so at water's boiling point, NaCl would be a solid. We can boil the solution and condense the vapor someplace else: the condensed vapor would be the water and the remaining solid of the solution would be the NaCl.
