A “sour” is a mixologist term for any cocktail made with a spirit, citrus and sugar syrup. In this case you’re getting bourbon, lemon and simple syrup. And what a combo it is! A touch of sweet vanilla from the bourbon with a lovely citrus tang for balance.
Savyll only use natural ingredients which sometimes creates sediment and cloudiness. If you see any, give your bottle a shake and you're good to go!