PREPARE CONTAINERS: Rinse clean plastic containers and lids with boiling water; dry thoroughly.
PREPARE A TRIAL BATCH: Measure jam or jelly into small bowl.
Add sugar and lemon juice; stir 3 min. or until sugar is completely dissolved.
Add pectin; 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 opened pouch of pectin 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 the same directions as for Trial Batch with the above-listed measures of sugar, lemon juice and pectin for each 1 cup of jam or jelly.
Pour into prepared containers. Discard any leftover pectin in opened pouch.