Do we finally have the answer to what The Rock is cooking?!...
Tequila!
Dwayne Johnson's company has filed documents to lock down the name "Mana" so that is can be put on tequila bottles. In the past he has talked about his love for the liquor when it comes to his preferred booze on cheat days.
As for "Mana" in the Polynesian culture that Dwayne grew up in, it's richly embedded in his life and even in his tattoos. For example the gigantic bull tattoo on his arm, epitomizes the term, in Spirit.