Have a GREAT time this weekend!
I love reading about the progress you're making (as I twirl my ring along with you

)! I can't wait to hear about what a fun and successful weekend this is for you.
Just a thought -- BEFORE you leave (like tonight, maybe), make up a shake, store it in a condition similar to what you'll have this weekend, and try it in the morning to see if you like it. And perhaps talk to someone about how long a made shake can be safely stored if not frozen. That way you don't get stuck in the middle of nowhere without edible Medigrub.
I've been taking a class all this week and mixing the packets in a half-full water bottle (just tear the corner so the powder doesn't go everywhere). Then I just pitch (ok, recycle) the bottle. Works great for me.
You are doing so well!! Isn't it exciting to find what really works for us individually?? Go get 'em!!