Myrna,
Epis are very easy to root. I've found it difficult to actually kill epis (getting them to bloom is a little trickier), short of not watering them or letting them freeze. I believe that in their natural habitat, they are creepers, and they send out roots along almost any stem.
Take a cutting and just stick it into the soil. Keep the soil moist, and it'll root. I've had cuttings in water for almost a year, and they're still alive. (I've been meaning to pot them up and give them away, but I haven't had time, and I can't bear to let a cutting just die.) They won't thrive or
flower by any means, but they'll survive.
As far as soil goes, a faster draining soil is better. Something that holds water better than
cactus/
succulent soil, but drains a little faster than regular potting soil. If all you have is regular potting soil, it should be ok. Like I mentioned before, it's hard to kill epis.