I use low sodium water.POTAWIE said:Carbonated water is also good if you're willing to spend the $$. Distilled water is "dead water" meaning that there is no nutrients and this certainly isn't necessary. I'm not sure about mineral water but I would assume there might be high salt content as there is in soda water.
Some magnesium and so on, but nothing extreme.
It's the same water that feeds entire forests in north of Israel and endless types of plants.
I wouldn't let my plants drink anything but the best.
This is what my plants get, 100% pure water: