An Americano is a shot or a double shot (according to the size of the cup) of espresso diluted with hot water.
To make an Americano, first add hot water to the vessel then add your shot(s) of espresso to the hot water.
The usual ratio is 1/3 espresso and 2/3 hot water, but you can adjust this to taste.
Depending on the system you use, we recommend the following products
Traditional Espresso Machine
Nespresso Compatible Machine
Paper Pods Machine