About 15 years ago I got my first colonoscopy and back than the prep was just horrible.
You basically went without food the entire day before, while at the same time take these prep meds that made you shit every hour or so. Good lord it was horrible as hell. If memories serves I was allowed to drink the day before but nothing the day off.
You get dehydrated so fast and it wild how terrible that makes you feel. Add to that, the taking a shit contstantly and almost immediately you are not shitting, it is more like pissing out of your ass.
The prep you have to do now is not that intense and really isnt that big of a deal, comparatively,.