Cool, thanks. Im aware of distillation as a method of purification, I just never really thought it would be practical in the sense it's not easy to collect the vapour. I guess it would be possible to make condensation tubes with aluminium foil, so maybe it is more practical than I thought.

I don't anticipate seperating alcohol and water. If we have any vodka in a world-gone-to-shit scenario, I'm boiling stangant canal water before wasting vodka!