Rootless - Water or not?

[dianecty]

Hi! I just read a thread on this site where a guy put a rootless orchid in a more open medium - bark. He watered it every other day and used MSU fertilizer. And after a few weeks, it grew roots.

This is in contrast with something I read that you have to under-water the orchid so that it will grow roots because it will go looking for water.

Which is correct? What is MSU fertilizer?

Thanks