Place the blueberries, sugar and water in a pan and stir to mix well.
Heat the blueberry mixture over medium high heat to a simmer. Then let simmer over low to medium low for 5 minutes.
After simmering for 5 minutes, crush the berries with a potato masher. You want to have chunks of blueberries so don't puree.
Then simmer on medium to low heat, stirring constantly until the jam jells. To test the jell, place a small amount of jam on a chilled plate and place in the freezer for a few minutes. If the jam is no longer runny it's ready.
Place the jam in a clean jar and store in the refrigerator.