How to care for Microcoelia cornuta?

[Wolfram1]

I don't own any other Orchids so i am unfamiliar with how to best care for them.

The friend i got mine from keeps his in a plastic bag on a windowstill, spraying it rarely and that seems to work and it has flowered a couple of times, but i was wondering if there was a better method since it doesn't look very nice.

I tried putting it in a container, laying atop some damp sphagnum-moss, but it didn't seem to like it and the new root emerging died back. So i am thinking there was too much humidity.

The same conditions seem to work for my bromeliad seedlings though...

How important is water quality with this kind of species?
Our tap water is very clean with minimal additives (Cl, F), great to drink, but it does contain some calcium.