Help!! my mother in law gave me all of her orchids. Tthey were all in awful condition

and I felt bad so I kinda begged her for them I hate to see them just croak. I cleaned them up repoted and watched them rebound like champs

. I guess I was a bit overzealous for one of the catts watering because the roots rotted away. I was wondering if it still saveable with no roots if I keep it in spag and a ziploc or what I need to do to save it.