most ramunes I've seen aren't in a colored bottle though...the drink is just colored. doesn't mean it wasn't a ramune though. this is what a ramune looks like (note the shape of the bottle, there's a marble stopper in the top):
so...was the drink carbonated? did it have any jelly or anything in it?
...I've seen aloe drinks in plastic bottles like the one you described...but Im not sure I've come across a melon one before.