Hello Archus!
I thought, it would be useful to share my observations on distilled water. I find the Megahome versions of distiller good enough. Much better and affordable than buying distilled water all the time. The distilled water from pharmacies tends to stay long time in plastic and it dissolves the plastic from the bottle/container since distilled is very powerful solvent. http://www.steamdistiller.com/water-distillers/
Hope this is useful. I also saw a good priced Concentrace on amazon.
Best
DL