That is not what I said. Distilled water comes in bottles...you can use that. You just need to use water that is appropriate for cannabis...google it and read up on it to learn why. Spring water is not the play. You can also use RO water or tap water, but making sure your pH is good is a good practice.
Nothing. Your plant is fucked. It is 4 months old and a month into flower. You can salvage what you can and just treat it better going forward and finish it out as a learning experience...but I would not expect much...your next grow will be better...might as well start it now, honestly.