The powdered rooting hormones don't work so well with orchids in general.
The hormones are supposed to be bound to the powder. And the powder is supposed to get onto the roots and help make it grow.
In orchids, the powder has a difficult time sticking to the roots because of how the roots are and because the potting media drains so freely, that the powder just drains right out the pot.
Now, The Home Depot sells lots of "orchid mixes", I'm not exactly sure how yours looks. If it has fine particles in it, that's going to kill the orchid off even faster!
Most Phalaenopsis grow on trees in the wild. Some grow on moist limestone cliffs in the wild. I have not heard of any Phalaenopsis orchids that are terrestrial at the moment, or rather I should more accurately say - science has not yet found a Phalaenopsis that grows as a terrestrial plant as of yet.
I highly recommend you read the sticky
http://www.orchidboard.com/community...ends-here.html, you will find much more info that will give you some basic insight on Phals.
There are liquid plant hormones available to the hobbyist, but these lab grade chemicals cost more than the plant you bought. And not any old hormone will grow roots. At this point, the whole hormone thing is probably quite a bit too much information to handle in one go. The information you will be receiving on this subject matter can be quite technical and be filled with science lingo, it may be quite a bit to process. So when you feel you can handle more info on plant hormones, go ahead and ask.
For now, I suggest learning about how to properly grow your orchid 1st.