Thanks for the read
The idea was that soulsstealers in opr are psychic and slowly corrupt their targets through subtle influence that grows over time. So the idea was the job was given and the snatcher was working on the leader, when the leader would check the hooch it would push on his mind to make him see regular stuff. Over time it keeps pushing him to one more job, even past where it's safe or smart,and giving the infected "booze" to his trusted people, and is strengthening its hold to the rest of the gang. Soul snatchers are also bio-specialists that modify their followers so I thought them importing alien matter to help the conversion along would make sense. Charles only sees it at home becouse she's not a higher up and the alien never anticipated her getting it so soon, so when she goes home and pours it into a glass instead of drinking it out of the bottle like Baz suggests the alien isn't aware enough of her to push her to see regular booze.
I guess maybe I was working from some assumed knowledge of the setting and should have tried to clarify more. Hope that helps!