My father who was based at RAF Friston in 1944 is sitting with me reading this thread and he remembers the filling of drop tanks with beer and hanging of beer kegs from Spitfires. He also has a vague memory of the Mustang having similar modifications to allow for beer to be carried but isn't 100% certain of this.
According to him it was not at all an uncommon a practice.
It has started a flow of more stories............