Glacial to Gangbusters
When S’well founder Sarah Kauss finally made the leap from making manual invoices in Excel to using QuickBooks, in 2010, she called in an accounting pro to get her set up. He looked at her statements—and the scant $2,000 she had left in savings—as well as the rent on her New York City apartment, where she was working and storing the 3,000 high-end water bottles she hoped to sell. “You know,” he said, after a long pause, “you could get a real job.” She didn’t. Instead, she spent two long years as S’well’s sole employee, bootstrapping her line of sleek, stainless steel water bottles with $30,000 in savings after a successful, hard-charging career in commercial real estate development. It paid off: The company’s overall sales hit $50 million in 2015—a fivefold…