D. filiformis is native to NJ, if I can remember those charts in Schnell's book correctly. Just grow it in an area of full sun (like a place that gets 4-6 hours of full sun every day, morning sun is better than late afternoon sun), and place it in a dish of distilled water (maybe like 2-3 inches deep of water, depending on the pot size). Then in winter it will form a bud called a hibernacula, and you can put the plant in an unheated garage or bury the pot in the ground, just so it doesn't freeze solid.
I haven't actually grown D. filiformis for long periods of time, mine died while in dormancy. But, they do enjoy a 50/50 peat/sand mix for their soil. I've read that they don't like long fibered sphagnum moss (that strandy stuff they use for orchids, if you don't know).
-Ben