Wash six 1-cup plastic or freezer-safe containers with hot, soapy water. Dry thoroughly. In a Dutch oven or large stockpot, combine water, orange juice concentrate and pectin. Cook and stir until mixture comes to a full rolling boil. Add sugar; return to a full rolling boil. Boil for 2 minutes, stirring constantly.
Remove from heat; skim off foam if necessary. Immediately fill all containers to within ½ in. of tops. Wipe off top edges of containers; cool to room temperature, about 1 hour. Cover and let stand overnight or until set. But not longer than 24 hours.
Jelly is now ready to use. Refrigerate up to 3 weeks or freeze up to 1 year. Thaw frozen jelly in refrigerator before serving.
