You could easily get it in even if there is security.
Go to wal mart or walgreens, any general item store like that, and go to the travel section where they have travel containers for shampoo, toothbrushes etc. They should have tiny plastic travel bottles for liquids, just put your lemen tech tea (or i would just use plain water and make regular mushroom tea....)in the travel bottle, and tape it securely to your boxers on the inside of your leg, right by your testies and such, they wont be looking there.
I see the reasons for wanting to do this, as when i do such things at concerts, i dont want to do them before i go for several reasons, The wierdness of passing through security while tripping, the crowd moving around alot, and also because there is usually an opening band, and i dont want the peak of my trip to be the opening band, i would rather wait a while.
Good luck brother, have fun and be safe!