Tips for helping 5 yr old child cope with 24 hr liquid diet + bowel prep for colonoscopy

We are having to face the reality that our child will soon need scopes due to extremely high inflammation on fecal tests. I am dreading the clear liquid diet just as much or more than the bowel prep. I've seen some prep protocols say to give a light breakfast the day prior to the scope and other protocols say nothing is allowed at all. I'm not sure which will be easier on him. I know once I eat breakfast it kicks my metabolism on and I'm hungry more than when I skip.

My child likes to eat, he's very active and healthy (we thought) and loves food. He doesn't normally have diarrhea but I know to use barrier cream prior to the bowel prep and after each toilet visit. I can honestly deal with poop stuff but it's very emotional for me to think about hearing my child crying because he can't eat all day and I just dread that. We will also be hours away from home and in a motel during the prep time. We will have limited amount of toys and home comforts but we will pack as much as we can.

We bought some jello, something he normally doesn't care for or eats, just to try to start working on it being an option for that day. He normally lives on water for fluids and doesn't drink much else aside from almond milk which isn't clear. So I'll be buying juices and broths. But I'm mostly looking for your experience on how your child handled the whole prep day, what you wish you would have done differently, tips or tricks, Etc.