Put down 4 to 5 pounds of the product in each 1000 square foot area of the lawn. Since you turned off the water to scorch the rye grass, that may have set back the bermuda... just a tiny bit. So at this point after you fertilize and aerify, simply water once each night, putting down about 1/4 inch of water. If your lawn has simple pop up sprinklers that don't rotate (simply pop up and spray)... run them for about 12 minutes per night. When the bermuda is about 80% covering the lawn, then water every other night for 16-18 minutes. The lawn will tell you if that's not enough water. Since you don't know what bermuda you have, adding seed will have a good chance of making the lawn highly non uniform. Let the underlying bermuda grass come back, it will unless something else drastic has happened. That should get you back to bermuda land.