So ds is off on a tour of the nightspots of Europe interrailing. He says he's going to museums
. He'll be both in Euro and non Euro currency countries.
Apart from carrying a bundle of different currencies in cash he'll get mugged or taking my credit card he'll lose it or using his own debit card he'll spend it all in the first week and get mugged and lose it what's the best way to safely travel round the train stations of Europe and pay for beer?