I am having my first colonoscopy next march 18th 2015, my instructions read to mix 17.9oz of miralax into 64oz of Gatorade , now everywhere on the internet I see 8 oz into 64 oz. should I double check with the dr.'s office its on a form they handed me today after I had the endoscopy done. Any suggestions, has anyone been told to use the 17.9 oz.? Thanks for the replies