Mr. Quintero has increased the store’s delivery people to three from two because deliveries have shot up to almost 70, from about 15 a day previously. Before the outbreak, the store had healthy foot traffic; with a few suggestions from Mr. Quintero, customers brought their selections to the register.

“I’m the only one here now,” he said. “I have to pull the bottles from the shelves or go downstairs and get them from the case. Entering all their information takes time, so does the scanning and logging. And people have a lot of questions.”

Mr. Quintero has noticed a change in the quantity, not the quality, of the wines being purchased.

“People are buying more, but cheaper and commercial stuff,” he said. “They’re not willing to take a risk and try something different right now.

“Rather than spend $30, they’re spending $12 on a bottle. They’re worried they’re not earning as much, and some aren’t working.”

He has also seen a surprising increase in giving bottles as presents. Mr. Quintero said that before the city virtually shut down, he wrapped one or two bottles a day and wrote “happy birthday” on accompanying cards. Now, he wraps about 15 a day and the cards address the stay-at-home order.

“People are sending them to make other people feel better,” he said. “They say, ‘Hope you’re getting through the quarantine.’”

New Yorkers might be buying more, but they should also pay attention to whether they are drinking more, said Dr. Yasmin Hurd, director of the Addiction Institute at Mount Sinai Hospital and a professor of psychiatry. “This is a vulnerable time for people with addiction problems, and those who don’t have one,” she said. “You have to take a look at that second, third and fourth glass of wine and be equally vigilant.” Dr. Hurd suggested that liquor stores put up signs that offer hotline numbers, substance-abuse programs and suggestions on where to get help.