I have a colonoscopy tomorrow at 1:30 pm. I'm unable to finish the last 32oz of golytley. Gagging)Can I finish the prep using mirilax and Gatorade? .

Almost equivalent. miralax (polyethylene glycol) is same ingredient of golytely, but mixing with gatorade would change the special salt/sugar balance of the lavage. making cold, or even squeezing a bit of lemon may take the unpleasant sea-water effect of golytely too. Equally important is what you have been eating before the lavage - no solids and definitely no roughage like fruits and veggies. See how clear stools are becoming.