What makes drunkards?

Bill poured the glass half full of whisky.

“Put in your own water,” he said. “There’s just one more shot.”

“Got any more?” Nick asked.

“There’s plenty more but dad only likes me to drink what’s open.”

“Sure,” said Nick.

“He says opening bottles is what makes drunkards,” Bill explained.

“That’s right,” said Nick. He was impressed. He had never thought of that before. He had always thought it was solitary drinking that made drunkards.

“The Three-Day Blow” by Ernest Hemingway