The “water detectives” that author Erica Gies followed are all asking the same question — she calls it “revolutionary.” The question is: What does water want? “Water wants more access to its slow phases,” Gies said. Her forthcoming book, “Water Always Wins: Thriving in an Age of Drought and Deluge,” details these detectives — water researchers who are part of what Gies calls the “slow water movement.”