How do you grow your Pinguicula (butterworts)?

[Leafmite]

I just have one type of butterwort but it multiplies rapidly and though I give them away at a nice pace, I still have three pots of them. I just set them in soaked NZ sphagnum moss, let them root, and then give them away.
A couple of years ago, I made some sort of mix for my CP's but I can't remember what I used to make it. Does anyone have a good recipe for a mix?
I keep my pings (and other CP's) sitting in water, always using rain or distilled water. They get cattleya light and tend to bloom ten months out of the year.