My first tour I did fresh out of college in 2003, 6 weeks in Europe. I had very little money. I bought a trek mountain bike used from a college kid that only road it once or twice. I think it was $200 and basically new. I borrowed camping gear and bought cheap synthetic shirts at walmart. I bought cheap nashbar panniers on sale. I had a great time.

My setup was HEAVY, but I didn't really know it at the time. Unfortunately ultralight camping gear is pretty expensive. I'm not sure I'd want to tour on a road bike with a full touring load. If I were you I would look around on craigslist and see if you can get a used rigid mountain bike, they make great cheap tourers. Not to say your current bike wouldn't work, I don't really know without throwing some panniers on it and riding around.