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Place half the strawberries and blueberries evenly between the jars.
Pour the jelly crystals into the boiling water and stir until they have dissolved.
Add the Austin’s summer punch and cold water to this mix and stir.
Pour over the fruit in the jars until half full and place in the fridge to set for an hour.
When the jellies have set, evenly distribute the remaining fruit across the jars and pour the rest of the jelly over the top (this prevents all the fruit settling at the bottom).
Leave in the fridge for another 1-2 hours.