Distillation is the easiest to maintain, but highest in energy use. I have a still (for perfume extract of course), that I can use to make pure H2O, but the human body cannot use pure water as it will strip electrolytes from you. So also have electrolytic powder to add them back to the distilled water. It is a balancing act. We have Berkey (need replacement filters) Stills (needs electrolytes added) Luckily we have a year round springs near my home with tested clean water.
Don't worry about the electrolyte thing too much, most of your electrolytes come from food, not your water. Add it if you feel like it but if you're eating you're fine.
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