Thank you everyone for your replies. I was a little skeptical about using this product and I'm glad I haven't tried it yet.
Ray, I was concerned about the strength of the mix - I don't want it to be too strong, especially since there's no moss or bark.
Katrina, I'm using regular tap water and fooferdoggie, I heard it has urea in it so I think I'm going to find something else.
Thank you all for your responses. I feel so much better about caring for my orchids knowing that I have folks on the board to answer my questions!