The fermentation process is 3-4 weeks for some kinds of beer so yeah I don't how they make beer instantly in a night unless they have activated yeast already or something. There are many different types of beers lagers, pilsens, stouts etc. I know because I'm trying to brew in my backyard. The main ingredients are barley, hops and wheat but some home brewers like to add orange slices, strawberries and whatnot for flavor. The equipment costs a lot of money if you try to make quality beer. Making it in a steel vat outside your house will cause a lot of problems in the long run as earlier stated so I reccommend getting semi-professional equipment atleast.