+1 on the Camelbak, I used one at the school in '01 and '02, so by now you should have no problems.
For the most part it is up to the discretion of your course staff what you can and can't get away with, if you bring a few key items for a good reason you're more likely to get away with it than if you bring the entire CP Gear line for the LCF...
Some items people on my course used:
- Camelbak (no-brainer!)
- Pair of good gloves (you don't have enough dexterity with the issued ones and if you don't use any gloves your hands will get torn up pepperpotting up and down the lawfield, I used Hatch kevlar shooting gloves)
- Extra boots in the follow-up kit (it doesn't matter how many pairs of boot you bring, they will all be soaking wet a few days into a FTX, thanks to the swamps)
- good boot insoles (superfeet)
- Knee pads (these might be issued now...)
- Stealth suit (it rains a lot there, and gets cold at night)
Other items you NEED:
- Ziplock freezer bags, several boxes of each size, pack EVERYTHING in them, you should be able to throw your ruck in the river and still have dry kit.
- Bungee cords and tent pegs for your half-shelter, bring more than you need as you will leave some in the bush during that 3am bug-out.
- Mosquito coils, gagetown is the spiritual home for jihadist mosquito's, burning coils is the only way you can eat or sleep in piece.
- A few packs of Staedtler superfine and fine PERMANENT markers, you'll loose some.
- LOTS of pairs of socks, see point above re: swamps
- Lastly, a sense of humour and determination, having the proper mindset is ten times more important than any piece of gucci kit you bring with you!
Good luck!