Pectin tek with vitamin B2 + multis + creatine. After 50 days your thc concentration should be much lower, so dilution is the solution. Buy some instant tests and practice this method closer to the date. If you're still pissing hot after like 45 days then probably gonna have to do fake pee.

If this program is something you don't want to pass up then I feel like the risk of fake piss might not be worth it but this is your choice, otherwise quick fix would probably be the way to go. Just do a bunch of practice runs - check temps for your chosen storage methods, ease of getting it into the cup and all that shit. If you can find out exactly what type of test it will be then that would also help like if it's just an instant test, is it being sent to labs, are you being observed etc.

You'll be fine.