Sphag and bag...

[Cinderella]

Hi,
I'm still trying to save my one plant (catt) that I posted on my other threads. I want to try the famous sphagnum moss in a ziploc bag with the plant and it's root. How much moss goes into the bag and do I change it at all? How long does it take to develop roots where it would be ok to repot? I also bought some premium cattleya medium and it is in an oxygen dual plastic pot. It dried out and killed most of the roots of another plant. We have been watering twice a week, but it seems like these pots or medium is not working. Puzzled.....

p.s. I couldn't find just sphagnum moss by itself so I bought it with peat moss. Has anyone tried that?
Thank you!