How to brew multiple batches at once

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I saw at the start of the game about brewing multiple batches, but quickly dismissed the dialog without reading it all. So how do you go about brewing two batches at once?
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How do you double batch a brew?
Double Batch Brew DayHow do you make large batches of beer?
3-Gallon All-Grain Batches By The Numbers The 3-gallon (11-L) cooler (lauter tun) can hold up to 6.0 lbs. (2.7 kg) of grain.How much grain do I need for a 3 gallon batch?
Normally, you'll want a fermenter that is slightly larger than your batch size. Example: a 3 gallon bucket for a 2 gallon batch, a 6 or 6.5 gallon bucket for a 5 gallon batch, etc. The closer your batch size is to your fermenter size the less air will stay on top of your beer.Make Multiple Soap Batches in One Session (my tips and tricks)
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Maria Orlova, Engin Akyurt, Edward Jenner, Edward Jenner