sweetened citrus fruit juice often served with added soda water

It's kinda slang for any watered down fruit juice, usually synthentic with lots of added sugar (or saccharin for the *really* cheap stuff). The quality stuff might even have real fruit!!!

That picture looks like Gourds, which are sadly inedible. I grew them when I was younger, and gave them to people to sell at village fetes etc. for decoration.

Gareth