When I had a bike with a tank bag, I used a mini pressurized misting bottle. Holds about 32 ounces I believe, and I would pump it up before I left, and would leave the hose accessible through a small hole in the zipper of the tank bag, sticking out just a bit. Every so often, I could grab the hose and mist myself, even my face with a full face on.
I remember it helping, but haven't used it the the f6b, as I have no tank bag.