Place fruit and cinnamon stick in a sterilized pint jar. Bring vinegar just to a boil; pour over fruit, leaving ¼-in. headspace. Center lid on jar; screw on band until fingertip tight. Refrigerate for 1 week.
Strain vinegar mixture through a fine-mesh strainer into another sterilized pint jar. Press solids to extract juice; discard remaining fruit.
Bring sugar and water to a boil. Reduce heat; simmer until sugar is dissolved. Cool slightly. Stir into vinegar mixture; shake well. Store in the refrigerator up to 2 weeks.
To serve, drink 1-2 tablespoons or add to a glass of ice, top with sparkling water and garnish with fresh blackberries.
Place eggs in a saucepan, and cover with cold water. Bring water to a boil and immediately remove from heat. Cover, and let eggs stand in hot water for 10 to 12 minutes. Remove from hot water, and cool. To cool more quickly, rinse eggs under cold running water.
Meanwhile, place bacon in a large, deep skillet. Cook over medium-high heat until evenly brown. Alternatively, wrap bacon in paper towels and cook in the microwave for about 1 minute per slice. Crumble and set aside.
Peel the hard-cooked eggs, and cut in half lengthwise. Remove yolks to a small bowl. Mash egg yolks with mayonnaise, crumbled bacon and cheese. Stir in mustard. Fill egg white halves with the yolk mixture and refrigerate until serving.