Like some insatiable thirst, the global soft drink market just keeps growing, and will be worth a projected $1.4 trillion by 2027. While ubiquitous macro brands still reign supreme, tiny artisan producers are gaining momentum, fueled by consumers who increasingly seek libations made from healthy, natural ingredients—ironically, something more like the classic fountain sodas of the early 1900s, when pharmacists concocted their own blends and sold them at their drugstores.