By Stephanie Apstein After two down years, the Astros third baseman is healthy, confident and back in form. Just before his highest moment, Alex Bregman stared at his lowest body part. His left foot—his front foot when he hits—had been betraying him for something like two years, and just as he had started to figure out how to put it where he wanted to, he lost it again. After his second at bat of Saturday’s Game 2 of the World Series, which his Astros would win 5–2 over the Phillies to even the series, he returned to the dugout looking disgruntled. He had put good swings on the ball in both at…