“I feel like I can walk into a party saying, ‘Oh, yeah, I brought the Topo Chico,’” said Dane Cardiel, 32, who works in business development for a podcast company and lives in Esopus, N.Y., about 60 miles south of Albany.

How flavored bubbly water with alcohol became a national phenomenon is partly due to social media videos that went viral and clever marketing that sold hard seltzers as a “healthier” alcohol choice.

White Claw’s slim cans prominently state that the drinks contain only 100 calories, are gluten free and have only two grams each of carbohydrates and sugar. The brand is owned by the Canadian billionaire Anthony von Mandl, who created Mike’s Hard Lemonade.

“The health and wellness element is front and center in terms of the visual marketing,” said Vivien Azer, an analyst at the Cowen investment firm. “Every brand’s packaging features its relatively low carb and sugar data.”

On top of that, the alcohol content in most hard seltzers, about 5 percent, or the same as 12 ounces of a typical beer, is less than a glass of wine or a mixed drink. That makes it easier for people to sip at a party or while watching a game without getting intoxicated or winding up with the belly-full-of-beer feeling.

“It’s a nice drink for an afternoon on the patio,” said Shelley Majeres, the general manager of Blake Street Tavern in downtown Denver. “You can drink four or five of them in an afternoon and not have a big hangover or get really drunk.”

Blake Street, an 18,000-square-foot sports bar, started selling hard seltzers two years ago. Today, they make up about 20 percent of its can and bottle sales.

The industry has also neatly sidestepped the gender issue that plagued earlier, lighter alcoholic alternatives like Zima, which became popular with women but struggled to be adopted by men.

“I’ve got just as many men as women drinking it,” said Nick Zeto, the owner of Boston Beer Garden in Naples, Fla. “And it started with the millennials, but now I have people in their 40s, 50s and 60s ordering it.”

That kind of broad appeal is attractive to beer, wine and spirits companies.

“We view ourselves as the challenger brand,” said Michelle St. Jacques, the chief marketing officer of Molson Coors, which has been making beer since the late 1700s but hopes to end this year with 10 percent of the hard seltzer market.

Last spring, the company released Vizzy, a hard seltzer that contains vitamin C. Top Chico came this spring. “We feel like we’re making great progress in seltzer by not trying to bring me-too products, but rather products and brands that have a clear difference,” Ms. St. Jacques said.

While grocery and liquor stores have made plenty of space available to the hard seltzer brands that people drink at home, the competition to get into restaurants and bars is fierce. Most want to offer only two or three brands to their customers.

“Oh, my god, I get presented with new hard seltzer whenever they can get my attention,” said Mr. Stone, who sells six brands at the Rambler. The crowd favorite, he said, is the vodka-based High Noon Sun Sips peach, made by E.&J. Gallo Winery. “Everybody, from the big brands to small, new ones, are getting into the hard seltzer game.”