Jason - Vodka is a carbon source that feeds bacteria. This includes cyano bacteria. IF you want to even start thinking of this, you should invest in some REALLY awesome bacteria source, ie. Prodibio or Zeo.....
Ask Mekaeel - he is still dosing vodka.... BUT - he is also dosing zeo....
Any type of Vodka would do, I presume. I dosed with Russian Bear at some stage.... BUT, after getting a bad case of cyano, I stopped - and never ever again had any cyano.... (that was last year - around November/December)...