CRANBERRY CREEK — A well-fitted life jacket can save a life.That's the rationale behind Hudson River-Black River Regulating District's new self-serve life jacket loaner program, which was unveiled Tuesday.Available until late October are about 50 vests, sized for lake goers ranging from ranging from toddlers to large adults, at HRBRRD's Great Sacandaga Lake field office in Northampton."It matters a lot," said authority Executive Director John Callaghan. "That's one of the things that we're trying to emphasize through this initiative is that people — especially small children — should always wear a correctly fitted personal floatation device."The first life jacket loaner…