We don't have Kool Aide in the UK. The closest thing we have is squash, which is made up of concentrated liquid cordial added to water, usually orange or blackcurrant, but comes in all sorts of flavours. I missed it when I lived in the US, couldn't find it anywhere, and it was too heavy for my Mom to post out to me. Us Brits used to sit round and dream about Ribena, which is a brand of squash cordial, blackcurrant flavoured! YUM!