1/2 - 1/8 C Sugar - I used 1/3 C or sweetener of your choice
Place your berries, water, and lemon juice in a pot over medium heat. As the blueberries "pop" use a potato masher to mash the blueberries. Gradually add the pectin as the mixture starts to boil. Continuously stir while boiling until the until you can't stir down the bubbles.
Add in the sugar, or your sweetener, and return the mixture to a full rolling boil for 1 minute, stirring constantly. Remove from heat and skim any foam that may have formed.
Carefully transfer the blueberry jam into jars and allow to cool for 30 minutes. Cover and refrigerate.