I'm really glad you're making the BM trip. I was thinking not long ago that you would probably regret not going after the event was over. It's great that you hooked up with some new BM mates.

As far a a pee funnel goes, I can't offer advice on that. I don't even want to guess. I would however suggest a large funnel with a Sharpie pen so you can clearly mark it.

I'm just guessing, but I don't think you want a dual-use pee funnel.

Make sure you have a quality sleeping bag. It will be very cold at night. Get one that's rated at least below freezing. I know they're not cheap but they're worth the expense.