Didn't you say that the tank you planned to take media from was uncycled? If so then wouldn't it not work? And from what I've read even with a fishless cycle you need to be there every day for water changes anyway. I'd just wait to cycle when you get back home.
There's also this product called Safe Start by Tetra (Used to be Bio Spira) that will cycle your tank in a week or under. =]
I think Walmart sells it (at least the tetra products website says so) if not then your LFS/LPS might have it. If no one has it and you're willing though you could just buy it online. =] That's what I think I'm gonna do because my Walmarts are out of stock right now and I don't want to get my tank FINALLY set up just to have to empty it for transport to college! >.<
It really does work too. =] it's even recommended on fishlore! =] BTW this is a page that will tell you how to cycle your tank. it even gives different methods so you don't have to go with just ammonia. =] http://www.fishlore.com/NitrogenCycle.htm