For an excellent guide to growing Disas, check out the eBook A Disa Companion, by Harley, Cywes and Linder. Available on Amazon. Also, Wally Orchard , of Afrodisa, sells some very nice plants.
The water where you live is special, I'm sure of it.It all depends on where you are Eric. Dead easy in the Uk. Almost hardy. Outside most of the year. Just need a bit of winter protection. Sit in rain water year round. Tiny bit of feed. People here grow them with their sarracenias. Need similar conditions. Repot spring or autumn. Also easy from seed sown on damp moss. Pods mature after about three months. Three years to flowering if you are good.
It's good to see someone in the U.S. interested in Disas, particularly if you're going to be selling them, Rob. I have a long history of killing them! I've been interested since I saw Acme Orchids in Ft. Bragg, CA, growing them from seed in a peat lite mix. Another, the Burkhardts, reached by narrow gauge RR by the Michiana intrepids, used a flowing hydroponic system. I've tried them at various times and always seem to kill them, but in some cases not before blooming. The suggestion for growing outside (in summer) may well be a good one.