Students across the country yesterday held demonstrations to pressure the Coca-Cola Company to be more transparent about the origin of the water it uses in its bottled water product, Dasani.

Demanding that the company be more clear that Dasani water comes from the same source as tap water, Corporate Accountability International – the group that organized the nationwide rallies – sponsored the Day of Action at Boston College, Tufts University and Boston University, where CAI company representatives met with environmental groups.

In July, the CAI held a similar demonstration against PepsiCo, which bottles Aquafina water. Pepsi responded the same day, stating its water comes from municipal sources and eventually changing the bottles’ labeling.

Charlie Stones, a CAI representative at BU, said he met with members of the Environmental Student Organization yesterday to promote CAI’s mission to investigate and publicize sources of bottled water. Stones, a College of Arts and Sciences senior, said he received pledges from 20 ESO students at the meeting who said they will stop buying bottled water.

“Part of today is letting people know that [their] bottled water is from a municipal water supply,” said Boston campaign organizer Liz Gary. “The bottom line is: It’s from the same source as tap water.”

Students also rallied in six other cities across the country for the Think Outside the Bottle campaign, which demands bottling corporations reveal and clearly label their water sources.

CAI asks students to contact Coca-Cola about its water sources and marketing tactics. Although BU will not form its own CAI group, Stones said he will work with ESO to incorporate CAI’s goals.

According to the World Health Organization, by 2025 two-thirds of the world will lack access to clean water. The United Nations has also predicted the next world wars will be fought over water supplies.

Coca-Cola spokeswoman Kirsten Witt said the company does not plan to follow Pepsi’s example.

“We state clearly on our website that we start with the local water supply,” she said. “It’s always been that case. . . . We don’t believe consumers are confused or that additional [information] is needed.”

Students should know where bottled water is coming from “so they know all about corporations controlling water sources,” Gary said.

CAI spokesman Nick Guroff said student participation and mobilization has been a key factor in the organization’s success.

Deborah Lapidus, a CAI national organizer, said three out of four Americans drink bottled water, and out of those people, 20 percent drink it exclusively.

“Corporations should not be threatening local control of water,” Lapidus said.