AVERE L'ACQUOLINA IN BOCCA has an entirely different meaning from ACQUA IN BOCCA( keep it for yourself) .
You have L'ACQUOLINA IN BOCCA (your mouth watering) when you see or think about  a food you like very much .ACQUOLINA refers to the saliva produced in the mouth.

I have a food that I can't resist and it always MI FA VENIRE L'AQUOLINA IN BOCCA: it's THE FOCACCIA DI RECCO.

If you have never eaten it,I really recommended to give it try!

If you google FOCACCIA DI RECCO,you'll find the recipe ,pictures and etc :)

Which food makes your mouth watering?