The River Wild (1994) on Netflix

Gail is a professional at water rafting. She twigs every day, and she is in very good shape. She takes her family on a rafting trip down the river, but she has no idea that the planned trip is about to become a nightmare. Two escaping robbers with a handgun meet the family on the trip, and join them. Only later does Gail realize that their new friends are dangerous criminals, but it's too late. The two men force them to stay together, and to keep cruising down the river. The family's lives are risked not only by the two men, but also by the river which becomes more stormy and wilder.