M.O.
I don't know anything about OCD, but I do know that kids this age THRIVE on routine. My daughter would watch the same movies over and over and over again. To the point where we put a TV in the playroom because I was sick of having my TV taken over!
It doesn't sound to me like this is an OCD issue, but more a comfort thing. She's particular. She likes organization. Can anyone say TYPE A personality?
As far as eating/drinking the same things, this too is comfort. Try introducing ONE new food each meal to her. Ask her to take a "tasting" bite. If she doesn't want more, don't push it. But do try to expose her to new things. She probably likes apple juice because it's sweet. Try to start watering down the apple juice - maybe add water to the jug when she isn't awake. That will help cut down her sugar and get her used to other juices that aren't as sweet. Also have her help make juice popsicles. Show her the juice you're using, like grape, then make them together. She might like trying her new creation.
Don't stress. This is a phase. Lots of little kids this age don't like change, don't want to share toys, or want their food, toys, etc. a particular way.
I think kids this age are just trying to control what they can - including what foods they will and won't eat. Be patient, but keep exposing her to new/different things.
Best wishes