Useful post, Archus!
Thank you for writing it.
I have some concerns now with my distilled water, having had it already for 10 years, probably. I feel that I need to alkalize it, since it has a low pH (probably from the carbon filter or the CO2 in the air) - about 4.5 - 5.
I am thinking to use Concentrace - minerals, that are from sea water with the sodium removed. Maybe 10 drops every second bottle. Maybe add a pinch of Sea Salt in the others ... see how it goes.