Powdered gatorade contains mostly
dextrose which would make it better to take with
creatine over bottled gatorade (mostly fructose). Grape juice works fine as well, and really there isn't much of an issue of taking it with orange juice or anything else acidic;
creatine won't break down that quickly.
Honestly though, I don't feel that it matters all that much what you take it with. Whatever it more convenient/tasty for you is what I would go with. I usually just mix it in with my pre and post workout shakes, which depending on whether or not I'm cutting or bulking will or will not contain
dextrose.
"I don't like people who take drugs...Customs men, for example." - Mitch Miller