PREPARE CONTAINERS: Rinse clean plastic containers and lids with boiling water; dry thoroughly.

PREPARE PECTIN MIXTURE: Gradually add pectin to water in small (1-qt.) saucepan, stirring constantly. Bring to boil on medium heat; boil 2 min., stirring constantly. Remove from heat.

PREPARE TRIAL BATCH: Measure jam or jelly into small bowl. Add sugar; stir 3 min. or until sugar is completely dissolved. Add 1 Tbsp. of the pectin mixture; stir an additional 3 min. Immediately pour into one of the prepared containers. Cover and let stand up to 24 hours before checking to see if set. Meanwhile, store remaining pectin mixture in refrigerator.

PREPARE REMAINDER OF BATCH: If Trial Batch sets satisfactorily, prepare remaining jam or jelly, remaking no more than 8 cups of jam or jelly at one time and using same directions as for Trial Batch with the above-listed measures of sugar and pectin mixture for each 1 cup of jam or jelly. Pour into prepared containers. Discard any leftover pectin mixture.