Florida and Alabama have rejected a tri-state agreement that would have bound them to confidentiality concerning the results of a water-sharing study being done by a private group, the Apalachicola-Chattahoochee-Flint Stakeholders. John P. Heekin, assistant general counsel to Florida Gov. Rick Scott, sent a Dec. 12 letter, and David B. Byrne Jr., chief legal adviser to Alabama Gov.