[TeMPOraL]

Not to mention ecological. I mean, in Poland, I can't find any sensible source of distilled water other than buying 5L plastic bottles of it. I've briefly looked into devices that could make distilled water, but all that I've found was some industrial-grade hardware that costs more than reasonable for personal use.

[IndrekR]

I have a small under-sink reverse osmosis system for that. Was ~250€. I think it is made in Poland. There are several like that around.