I have done water, direct to soil, seem to have better results with direct to soil. A friend roots hers in some Sphagnum moss. I've used the sphagnum moss to root some Hoya's and it works great. I had roots in a weeks time.
Bonnie was a slow starter for me, everything else was putting out new growth in 3 weeks, the Bonnie took more like 5. It's growing great now. I have 12 different spiders and now that they have some size to them it's vert clear the different characteristics. "Bonnie"is a slower grower for me.
These spider pups went to soil, about 3 weeks in this photo.