Since you're local, here's some tips for our games:
1) get good eyewear. Don't cheap out on the eyewear. Not only for protection, but also to help prevent fogging.
2) the radio... don't waste your money on the half watt FRS stuff. If you're going to get one get a 4W UHF. There's plenty of threads covering radios already, just do a search and do your homework.
3) how you carry your water is a matter of preference. Most people do find it more convenient to use a hydration bladder; not only to carry the water, but to be drink regularly and stay hydrated.
4) you might want to consider waterproof boots, specially if you play outdoors a lot, moreso if you plan on playing in early spring and late into fall or even winter.
Likely, think about how you'll set up for rain (hint: Quebec has an association of organizers: being a no show due to bad weather is the fast track for getting blackballed from events).