A few years ago
Hawaii Magazine did a story about the Meadow Gold POG, it mentioned it was only available in WA, OR & CA, but that was from 2008 so things change. Some other stories talk about how the owner of MG ended up being sold. It's now locally owned in Hawaii as, Meadow Gold Dairies Hawai'i. I do wonder if there are issues importing this product - assuming that Disney is actually using the Meadow Gold POG.
As part of the story I linked to they shared some information about recipe for POG and how the magazine tested it vs the origional. It's worth a read. That said they said the submittor used, "Mix 1 cup each of Kern’s guava nectar and Welch’s passion fruit nectar with 2/3 cup of Minute Maid no-pulp orange juice. Chill. Serve." after testing that they suggested using less the 2/3 cup OJ. To be honest I like how they said "...Cheryl’s recipe came off a bit more adult than real POG. We wanted to add rum to it." - Rum and POG is a winning combination!