Sour apple flavoured drink tesco/asda can't remember name?!
Just can't remember what it was called.
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Caprio is a Green apple drink available in Tesco
Tymbark and Kubus are other fruit drinks available. I don't know if either of these do a 'sour apple' flavour.
If it was alcoholic, it could be Apple Sourz sweet and sour apple liqueur, that is bright green!