"Squash" in the UK is a drink, usually made from oranges. Could be an orange syrup, which you pour into a glass then add water, or a bottle ready prepared.I'm not understanding the squash correlation?
As a kid, I never had fresh orange juice; it was always orange squash.
I'm amazed that it's still produced, but it is:
Orange squash
I distinctly recall a friend from uni going to the US on holiday and asking for squash and biscuits ( UK translation: orange drink and cookies) and wondering what the heck had happened when he got pumpkin and scones.