Bring 4 cups of water to a boil
Transfer the Thai tea mix into the loose tea infuser of a teapot, then pour the boiling water into the teapot, allowing the tea to steep for at least 5 minutes. (Alternatively, you may transfer the tea mix directly into the pot of boiling water, then strain the tea using a mesh sieve).
Transfer one tablespoon of condensed milk (or to taste) into a glass or mug, then pour in 1 cup of Thai tea. Stir until condensed milk is completely dissolved.
Fill a separate glass with ice, then transfer the tea into the glass. Optionally, top the drink off with a some evaporated milk. Enjoy!