The best beers in the world are easier to get than ever before. Forty years ago, customers strolling through grocery stores would only find endless variations on the easy-drinking domestic lager. Care for a Busch? Miller High Life? Bud Light? If you were lucky, you might find an imported Irish beer like Guinness, a beach-y Mexican beer such as Corona, or perhaps even Foster’s, that Australian beer sold in the oversized can. Today’s hopheads can pick from tens of thousands of the best beers that deliver every conceivable flavor and alcohol level. Hazy double IPAs are now sold alongside zippy...