Tart sparkling grape juice?

[zappp]

I recently stopped drinking alcohol, and want to treat myself to some nice juices and/or soft drinks (in moderation, of course).

This will sound ridiculously trivial, but I remember drinking a really delicious grape juice years ago - it was carbonated/sparkling, and tart rather than sweet. No idea what brand it was.

I've bought three grape juices so far (Schloer's red and white and Welch's), but no luck so far - they are all sickly sweet to the point where I can't finish them.

If anyone can help me find the juice I'm looking for, or something close to it, I'd be very grateful! I can compromise on it being sparkling, but not the tartness...

Not what you asked for but Cawston Press are nice and are just juice and sparkling water including one that's got Rhubarb in, so not sweet.

M&S also have some similar canned drinks although I can't remember the flavours.

Also what about tonic water (I like Waitrose own brand, as cheaper than Fevertree, bigger cans and no artificial sweeteners unlike just about every other type).

Thank you @Bjorkdidit! Annoyingly I don’t like tonic water - it was my least favourite part of G&Ts when I was drinking 😂- which is annoying as my parents love it and buy it in bulk. I’ll try your other suggestions though, they sound good!