For decades, hot dog lovers have argued whether it’s okay to put ketchup on a hot dog. I’m a purist who says ketchup has no business near that bun. But a company known for battling to change perceptions thinks they have a solution. The bottlers of Pepsi are getting into the condiment business for something they call Pepsi Colachup. It’s a combination of ketchup and the world’s second-favorite cola. But if you want to try some, there’s a huge catch…