I have been looking for a green apple recipe for years and have yet to find anything like the ones I can buy at stores. I have bought countless brands of green apple, red apple, green apple candy etc and it all tastes like shit. Either perfume flavored or off. Where the store bought stuff has a bright green apple flavor with a mouth watering juicy feel to it. The main green apple flavors I know are good are from Revolver and vapewild.

Maybe play with this recipe of Keith's?

Get rid of the watermelons, keep the Hard Candy and Super Sour, and play with some apple flavors. I consider it a "juicy" tasting juice. I've used FA Fuji before and liked it. It's not a green apple, of course. But with the Super Sour, you'll get that tart flavor that a green apple gives, anyway.