Re: Father in law recently had surgery and I have questions
You don't say how old he is and that could play a big part in how quickly he recovers from surgery. I assume he has an ileostomy or colostomy? At any rate with 3.5 feet of colon gone he is going to be prone to losing electrolytes and water. This will make him dozy. Perhaps a sports drink like Gatorade can help and they taste better than pedolyte. Try to get him several flavors and different brands to find one that he likes.
While on chemo I liked orange flavored Safeway brand sport drink and found that Gatorade was more expensive and tasted too salty. I also like iced tea made from green tea and with a little lemon, light on the sugar.