Regarding the problems of how to make slugs get into the beer to drown, what we do here in Britain is to bury the container so that its rim is level with the ground surface - then the little horrors have to get in in order to get the beer.
Crimson, it is considered custom to provide a link to the column you are posting about: Link
Welcome to the Straight Dope Message Boads, crimsonlicketysplit, we’re glad to have you with us.
When you start a thread, it’s helpful to other readers if you provide a link to the Column that you’re commenting on. Helps keep us all on the same page, avoids people saying things that Cecil already said, saves readers (and the hamsters who run the server) the time and energy to search, etc. No biggie, you’ll know for next time.
In this case, I presume the column is If you pour salt on garden slugs, do they shrivel up and scream?
As I say, welcome!