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The teens recorded Jamel Dunn, 31, struggling in the water on July 9. The teens were heard laughing and saying they were not going to help him.
The man's body was found days later. Police said they don't know why Dunn went into the water.
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Authorities interviewed the teens, but do not expect to charge them because the state of Florida does not obligate citizens to render aid or call someone to render aid to a person in distress.
A GoFundMe page has been set up to help Dunn's family pay for funeral costs.
According to the GoFundMe page, Dunn was last seen on July 9, but his body wasn't found until July 14.