I think we have a serious medical disagreement on our hands, so to speak. With due respect Steve, I think your prescription is the complete opposite of what is required here. It's a well known medical fact, or at least Chris Z tells me it is, that the glycol content of anti-freeze is an irritant to the small intestine. So Slick 50 by definition will cause the movements to be not so much stools, but more like door mats.
No, I have a better prescription altogether, namely Holt's Radweld. Taken anally, it'll tighten things up a treat and provide comfort and safety to the patient for the whole week. That or poison him to death, one or the other.

Oh, and for some post palliative care, I'd recommend a course of Radflush when you get home.