Combine water and sugar in a medium saucepan over medium-high heat and whisk until sugar dissolves, about 2-3 minutes.
Add cranberries, salt, and orange juice and bring to a simmer.
Reduce heat to medium-low and cook for 12-14 minutes, stirring often, until berries burst and break down into chunky sauce.
Remove from heat and stir in orange zest and extra 1/2 Tbsp sugar.
Taste and adjust salt as needed.
Cool completely before serving, about 30 minutes at room temperature.
Garnish with extra orange zest if desired.