I smuggled a little bar onto the train because madame needs a Negroni when traversing the country! I used my bangle flask to house my gin and smuggled on some vermouth minis. The Negroni is the easiest cocktail in the world and a recipe one should always have in their arsenal.
1 oz Gin (I used Whitley Neill Original London Dry)
1 oz Campari
1 oz Sweet Vermouth
Pour over big ice, or whatever you can get on a moving vehicle, stir and garnish with orange if you have any available. Always travel with an orange! IF I HAVE LEARNED ANYTHING IN LIFE IT IS THIS.