If using frozen blueberries, allow to thaw first so that it's easy to smush them into bottles. Line up 4 bottles (25 ounce) with flip top lids. Smush ½ cup blueberries into each 25 ounce bottle.
If using frozen blueberries, allow to thaw first so that it's easy to smush them into bottles. Line up 4 bottles (25 ounce) with flip top lids. Smush ½ cup blueberries into each 25 ounce bottle.