Liquid I.V., the powdered water enhancer acquired by Unilever in 2020, is closing in on $1 billion in net sales, according to the company. The brand will reach the milestone in the “near future,” the company said, while declining to define that timeframe. The “hydration multiplier,” which promises to hydrate as much as 2.5 times faster than water and is used by some consumers as a hangover remedy, is the largest single-serve drink mix brand on the market with a...