Wrap the brisket well in plastic wrap or butcher paper and place it in an air-tight container. Store in the fridge for up to 4 days. Store in the freezer for up to 3 months. For best results in the freezer, remove as much air as possible from the freezer container. I like my food saver for this. To reheat, allow the brisket to thaw in the fridge overnight and then heat in the microwave for about 2 minutes at 50% power.