When I had my colonoscopy I got Dulcolax and Metamucil . Which worked out ok. Just drink it really cold.

Also they may tell you to mix the Gatorade in 48oz bottle. They don't make those anymore. Just get the largest and split it.

I found as well after a whole lemon and lime jello was too acidic. If you drink broth splurge for the nicer ones

Hopefully yours isn't in the afternoon like mine was. I was so ready to get it over with