different countries have different ways to make beer. in germany, austria, switzerland, czech republic, and slovakia, beer is usually made from just hops, malt, water, and yeast. this is because of the reinheitsgebot. the reinheitsgebot was a law that said says that beer can only be made from hops, malt, and water. yeast was discovered after the reinheitsgebot. the law was overturned by the european union in 1992. in belgium, however, beers have always been made with wheat, sugar, fruit, and other ingredients.