There are so many different qualities ("degrees of purity") of bottled waters. I would say most would not be good and will have many dissolved solids or sodium for taste.
Just my .02 I don't have much experience. I would buy an RODI unit. 100-150 shipped on eBay.
Some brands of bottled water are straight out of the city water supply. The source must be listed on the bottle and it will say something like "Source: City of _____" if that is the case.
While that certainly doesn't appear to be the case for the one you've shown, I thought I'd mention it for anyone who didn't know.
I would avoid this water. As it was said about it could just be bottled tap water. I would get RODI water and store it in case it is needed for emergencies.
I have RODI but the pump boot working I call already the service and they will come Sunday we have here in Qatar very high temperature so the Evaporation is to high I don't have back up RD water
Kurt they don't mentioned any thing regarding the source
It looks OK to me based on what it says is in it, but you can't always know what is not listed. The potential for copper would be my biggest fear. It will add a little alkalinity, but that's only an issue if you made up a whole tank with it.
Based on sodium and other elements it has a tds. Anyone ever take a tds of your tank water mine is about 150is this is with using ro/di for water to start