I don't follow your question.
I've found the roots from a seedling reach the water quite quickly, usually within the first week or so. For plants that I've converted from an all soil based pot, it took 2-3 weeks for the plant to convert soil roots to water roots, although you probably wouldn't have that issue if you used all soil throughout.
This structure should be thought of as a very effective watering structure, but that is independent of what you use for a medium. Buds is using MC? I believe, but it will also work well with an organic soil. But, either way, you still have to feed it with the stuff you normally would. If you used a Coots mix, or The Rev's organic mix you might be able to get away with just water if your container was large enough, but I don't think a 5G bucket would be.
I think the absolute easiest would be Geoflora and tap water which I think is what Emilya will use for her new SIPs she is building. No pHing, no fussing with worrying about chlorine etc.
But, lots of media will work. I have yet to find an account of someone who was dissapointed with their results using these things.