I became discouraged with DW from the markets as it was not consistent.I ended up buying a fairly expensive distiller and have not regretted it.In 8 years it has more than paid for itself as I also use the DW for all my drinking and cooking as our tap water is highly chlorinated.Even having filters in the system,a primary and then a secondary,the water still does not taste good.The DW for potable is treated with Concentrace minerals to bring it up to the proper pH . For EIS brewing I draw off the tap water in 1 gallon pails and let sit for approx. 24 hrs to let the chlorine work out.
Harold