Michael's "secret stuff" is a small water bottle. It is color blue and has a yellow space that says "Michael's Secret Stuff."
At the start of the basketball game, all Looney Tunes were prepared to leave the match where the match would take place.
Despite Michael Jordan's leadership, the Monstars dominated the first half of the game, reaching the break with 54 points ahead. However, Stan Podolak hid in the Monstars' locker room and heard them talking about how they stole the skills of NBA players. Then, Stan reported this to Jordan and the Tune Squad. Subsequently, Bugs Bunny motivated the team with a "special drink" (which was actually only water) and in the second half, the advantage of the Monstars was significantly reduced especially by Michael's help.
In the third half, the Monstars were striking back but not yet winning the whole game, and Michael Jordan tells the Tune Squad that the Secret Stuff drink was simply water and they do not need it.