Glad you guys are finding some of it helpful.
SkaBob - It's just rit and water. I for one would NOT recommend using acetone around the stove, especially if you have a gas range. We claim no responsibility for any experiments you might try at home!
I believe each of those mixtures was one full package of Rit and I dunno, maybe a quart of water? Maybe less? So yeah, super concentrated, and totally reusable.
jnecessary - search under "application tape" and you should find what you're looking for. This is just one sign shop that came up: http://www.signsupply.com/Vinyl/Ap_Tape/Ap_Tape.asp
Chuck can probably tell you more, but I believe he just got the most basic kind of tape.