Answer:
Appratus needed: Bunson burner, condenser, round-bottom flask, beaker, stand, heat proof mat
When the water is heated and changes into steam. when the gas hit's cold air or something cold it will cool down. It then condenses and becomes water.The water is caled distilled water which contains no micro-organisms,or insoluble impurities or soluble impurities.The process contains condensation and boiling.
For the appratus set-up,you may search it in yahoo.I am not able to post pictures here.
Novanet answer....evaporating and condensation