Step 1.  In a medium sized sauce pan, mix together blueberries, water, 1/4 cup sweetener and lemon juice.  Bring to a boil over Medium heat.  Lower heat and simmer for 15 minutes, stirring often.  The mixture should thicken  considerably.  Taste for sweetness, and add more, in tablespoon measures, until it reaches the desired sweetness.

Step 2.  Sprinkle Xanthan Gum over blueberry mixture and quickly whisk it in.  Cook for 2 minutes more to thicken further.

Step 3.  Cool to room temperature and then pour jam into a resealable container and store in the refrigerator for up to 3 months.