I like Tescos flavoured mineral waters as well.
LiDL recently introduced six-packs (500ml bottles) of their own-brand flavoured mineral water (Carrick Glen, the flavours I saw were lemon & lime, apple & blackcurrant and strawberry & kiwi -- I don't know if there are any others). After checking the labels (ridiculously microscopic print, I swear it was only about 2pt type) to make sure they were no-added-sugar, I decided to treat myself to one pack of each. Big mistake; despite ranging from 0.2 to 0.5 grams carbohydrate per 100ml, they turned out to be far, far too sweet to my taste. I've given the remaining 15 bottles to William; he's been smoking for years, so it's a wonder he can still taste anything at all.