Mr. Gilmour sold Fiji Water to Roll International in 2004 and Wakaya to Clare Bronfman, an heir to the Seagram’s liquor fortune, in 2016, after a Category 5 cyclone devastated the island.

David Gilmour, a Canadian-born entrepreneur who made millions in real estate and gold mining but remained best known for bringing a glamorous, square-edged approach to hydration as the founder of ...