Heat the water and sugar until boiling in a microwave-safe French press or liquid measuring cup. Stir the water to ensure the sugar has dissolved, then stir in the Thai Iced Tea mix and let sit for 10 minutes to steep.
Plunge down the strainer if using a French press, or strain the solids out of the tea by using a fine mesh strainer, cheesecloth, or coffee filter.
Chill in fridge for 1 hour or until cold.
To serve, pour 8 oz. (1 c.) of tea into a tall glass over ice. Top with a slash of half-and-half. Drink immediately.