I'm not being reckless. [A little defensively, a little huffy. Excuse him!] That's why I'm watching people to see the effects. Such as--

[He points to one of the guests who have been reverse mermaid'd.]

Don't drink the seawater. I don't know why anyone in their right mind would, but... [He shrugs.]

I also suspect one drink gives the user the ability to breath underwater, or hold your breath for longer, but I haven't figured out which one.