The analysis of Aquafina looks good. Aquafina is fine to use for CPs & saltwater aquariums and does not have added minerals or salts.
1st off, do your pots have drainage holes to suck in water from your tray? I have the same type of pots lying around & mine do not have drainage making tray method pointless. There's another thread that just started on getting rid of fungus gnats which may be another problem & will only do harm to a weakened plant. Besides those 2 points I would add some supplemental artificial light & it should recover just fine. Good luck