Golytely theoretically contains the appropriate amounts of electrolytes and minerals, in and of itself, to prevent dehydration and keep everything "balanced". That is why it is used, instead of the old Citrate Mag/Biscodyl/8oz of H20 every 15 minutes for "X" hours that used to be used and caused problems.
I also do not see where gatorade would help the taste that much.
I would think that adding gatorade instead of water would throw things waaayy out of balance, the other direction and result in serious excessive electrolyte levels. Most MDs will not even permit koolaid w/sugar added as the sweetner will alter it and cause problems. That is why the company itself has several specifically prepared flavorings.
I have to have prep every two years (UC patient) and this the information that I have been given.