In the UK, a lot of people drink squash, which is a concentrated fruit-flavored drink you mix with water. It’s not the kind of stuff you can drink straight…you’d probably puke.
Ribena is the I remember drinking as a kid. It’s blackcurrant-flavored. Yeah, blackcurrant.
I suppose the closest thing to squash we have in the US is that frozen Minute Maid orange juice concentrate.