The Crossfire is a great bike, suited to comfortable day long use and still light enough that you can do good mileage with out getting exhausted.
Don't forget to carry a spare tube or two, just in case you are the only guy running 700x35 tyres. Tyres should just pop off easily if you do get a flat. If you are covering a big distance over several days, check your bike gears and clean/oil your chain if it gets grimy/dry/claggy.
A frame mounted bottle is fine, other options are a camelback if you want to carry more fluids. If you are using energy drinks in your bottles or bladders, make sure you clean them well after every use. That stuff is a great medium for bacterial growth and food poisoning on a bike is nasty.
Cycle shorts are a great investment and prevent chaffing of your delicate parts. A small pot of lip balm or vaseline may be of use if you develop a sore spot. Trust Aunty Jayne, she knows what she talks about.
