Please, for the love of all that's sweet and holy, have your creation eating, drinking and dressing as appropriate to their setting.
In particular, snacks. Brits in a hospital waiting room do not munch on Graham Crackers. Australians at the train station will not drop coins into a machine for a Tootsie Roll. And it would be a strange American indeed who asked at their local restaurant for a Chico Roll and a packet of Jaffas.
So, for your edification, here are some of those "Home Food" sites so that you can browse the British Biscuits and give your poor hospital people some Jammie Dodgers and a nice hot sweet milky cup of tea. Your Australian can have a Tim Tam and chew on the Minties. The Yanks can have their Oreos and a Coffee Regular.
And I can read the stories without losing my suspension of disbelief.