I'm a little late to this party :p I usually eat lightly about 3 days before (little fiber, no heavy meals -- mostly soup, eggs and fruit) day of prep is liquids only including jello, popsicles, and broth. Mine always say nothing red, purple or blue. Orange, green and yellow are ok. I hate gatorade so I mix half of the miralax in water and the other half in just half the amount of gatorade. Then I alternate a glass of water and a glass of gatorade.
Good that you are clear already. Part 2 will be easier.
I hated the Gatorade too. I use white grape juice. What a difference!