Water makes up over 90% of beer. Different mineral content is better for different styles of beer
Malted barley forms the base for beer. It supples the energy source that will be converted to alcohol as well as colour, flavour, aroma and body
Hops are the spice and seasoning of a beer. They give bitterness to balance malt sweetness, flavour and aroma. Hops are naturally anti-bacterial and were originally used to stop beer going sour
Yeast is a micro-organism that is essential to produce alcohol. It consumes sugars and creates alcohol, CO2 flavour and aroma