Take your burnettes and run it thru a brita filter 2 or 3 times, purify it some, otherwise you might as well be buying rubbing alchohol.

Seriously though, filter it, and you can eleviate a lot of the impurities that cause the hangover. Some say it purifies it up to a level of grey goose, I won't say that, but if your mixing it you won't be able to tell anyway.