This is a dead-simple drink that costs almost nothing—lime, sugar, and black salt are all stocked at Harris Teeter, Food Lion, Kroger, and Walmart, with soda water a trivial add-on. The stated 1-minute time is honest; you're squeezing a lime and stirring. It's refreshing in Charlotte summers and the ingredients keep well. The only real friction is black salt (kala namak), which if you don't stock it requires a deliberate trip to an Indian or international aisle, though many Kroger locations now carry it; if you must substitute with regular salt, the drink loses its sulfurous depth and becomes ordinary lemonade.