Prepare canner, jars and lids. See The Ball Complete Book of Home Preserving for guidance.
Put blueberries in pot and crush with potato masher or slotted spoon.
Heat over medium heat, stirring frequently
Once blueberries have released their juices, pour into fine sieve over bowl.
Let drip for 1-2 hours, stirring blueberries every now and again, until juices have collected in bowl.
Make sure you save blueberry pulp to put over your yogurt, ice cream, waffles or pancakes.
Combine juice, water, sugar and tea bags (or tea in infuser)
Bring to a boil, stirring frequently.
Let boil for 2-3 minutes, stirring frequently.
Then reduce heat to produce a very slow, gentle boil.
Stir occasionally, but let slowly boil/simmer for 20-25 minutes.