This is a fact of touring. A tour bus is a rolling wet bar. That wasn't the only alcoholic beverage listed. There was probably a bottle of wine and one of liquor as well. And this is virtually every night.
Tour buses have really big built-in ice coolers in the front and back lounges.
You load in your beer and what have you, and ice it down. It will stay cold for about 18 hours. At the start of the tour there's lots of room for ice. But after about two weeks the cooler never gets empty enough to accommodate todays fresh supply of drinks. And I have never seen a band give back something on the because they had too much of it all ready.