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From what I could conclude from the short show enacted by Leicar, was that my initial guess was right in every aspect. 

Starting with the liquor part by itself, it was just a juice of a specific fruit squeezed out and mixed with the pulp of a common plant otherwise used as a painkiller. From what I realised during the show, the liquor was only responsible for the initial relaxation, with the real magic happening thanks to the boiled leaves.

Surprisingly enough, it was Leicar who explained those things to me, as if it was a common knowledge instead of a state-keeping secret! 

But soon later, I got to learn the true reason why it was kept in the open.

Chrilaka Fruits, from which the liquor was squeezed out, were foreign to this island.