Richie,

"Red Apple Juice" appears to be a variant of several traditional blues songs about love gone wrong, or love going wrong.

My guess is that the words "red apple juice" literally refer to red colored apple juice {cherry? strawberry? flavored apple juice} that the singer's woman made for him. I don't think that these words mean anything more.

In my next post to this thread, I'll post the lyrics to several similar songs that I found online.