I was told to use only lemon-lime, or lemon drinks (or some other clear type) with the miralax. No orange, red, or purple drinks. I guess the more colorful drinks can make your insides pretty colors. Also, refrigerate the powerade before using it. I bought some, mixed the miralax in it, and then put it in the fridge for a day. Give it a good shaking again before drinking.
36 y.o. male
Diagnosed w/ moderate UC in May '06
Asacol, Florastor, VSL#3, Wellbutrin XL, Prozac, multi-vitamin, Allegra, Lialda, Colocort enema, Prednisone (12.5mg and tapering down)