Keurig Green Mountain, the company best known for getting millions of people hooked in single-cup coffee brewing, is now hitching its wagon to fizzy bubbles as it prepares to take on instant carbonated drink-making king Soda Stream with Keurig Kold, its own one-button carbonated drink machine. While Keurig Kold was announced earlier this year , Keurig finally unveiled the product and gave journalists a palate-on experience on Monday night in Manhattan.