The good thing about this stuff is you can't overdose, and you can take it with your other medications because the ingredients are all natural.
If you want it to have the funky effect of NyQuil, I'm sure you could add a splash of whiskey :) But only if it doesn't mess with your other medications.
*A little thing extra I do is take a Ricola (Org.) lozenge and put it in the batch I'm heating up. So the menthol in the lozenge melts a little into the mixture. You don't have to melt the entire cough drop, think of it as a treat at the bottom of your cup when your finished.