I was curious so I lurked around the net a little. If you choose the route i suggested you'll need a file that is placed on whatever machine you use Steam to activate your game with. It's called "ClientRegistry.blob". You'll need to move this file from that machine back to your home one, assuming that you have zero net back at your house this might prove a problem.
If you had some kind of net there I'd suggest just emailing the file to yourself as it's under 1 mb. Alternatives to email is the use of a floppy disk (if your comp has one, mine doesn't), burn the file to a disk, or use a flash drive. Flash drives are pretty cheap, I have one for all my papers. I got it for like $12 US iirc.
If you're into some manual labor you could just move your machine to an internet source, a buddy who is into gaming would likely understand your dilemma.
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