No Colloidal Silver should be either Distilled or De-ionised (which isn't as good). RO still have impurities which will damage the CS for storage.
You can use Distilled or RO for quicker Ozoning times. The more impurities the long it takes! I use Distilled water which has then passed through a high bovis structure machine called the Vitaliser Plus. This then helps hydrate myself and cells far better than any other water and with ozone inside too ;-)