"Can't be made at home due to unusual ingredients..." Aluminum sulfate = baker's alum. PEG 1500 is a slightly lighter molecular weight version of the PEG 3350 in Mira-Lax. Amylopectin is just corn or rice starch. With some effort, I imagine the 'doh' part would be pretty easy, though probably more expensive than buying it ready made. The smell on the other hand would be difficult to replicate without knowing most of the ingredients.

O.K.? I thought all vets knew that Vitamin K was the rat poison antidote? Rat poison works by inhibiting clotting factors, causing a rat to die of internal bleeding. If he'd bled out that much, how would a 120mL (one-half U.S. cup) save him? Need more details.

EDIT TO ADD: 260mL is a typical feline blood volume so the cat had bled out severely. Though, I would imagine Vitamin K and fluids would have saved it.