Hello Fabius!Wow!
That sure sounds exciting! If I could, I'd love to be there in person to see you guys in action!

And we would absolutely love to post as many pictures as you can take! We're all excited for you!
As far as body paint, I suggest the Urban Decay Body Paint Kit with Temporary Tattoos website.
Although I've never tried it, the advertising looks pretty good. The website states "Long-lasting paints will stand up to swimming, dancing, exercising, etc." The kit only costs $28 US, so its not too expensive.
Hope this helps! Have a good time, and don't forget to pass along those photos!