E111, Travel Ins, Passport, Currency, Train Tickets, hotel booking. Bank Cards.
Socks, Pants, Trousers, Shirt (s), Jumper, Mac. Optional: Shorts, Trunks (Boxer type for private pool, speedos for Municipal pools), Night wear (?) Hat.
Shoes, Flip Flops (good for dodgy showers)
Wash bag including bug stuff.
Medication - List of all that you are on with doses. Doctors Letter with diagnoses on.
Talc. 
Food and Bottle of Water.
Books, Map, Itinerary.
and . . . . .
Smartphone or Notebook to report his adwentures
Anti Maggot spray Anti Nick spray for the maggots
Phrasebook with menu reader
Wheelbarrow
European plug and English Extension Lead with multipoints
iPad, iPod, Laptop, Camera, Camera and Phone chargers.