Make it yourself.
Thai tea leaves
Cinnamon, cloves, ginger, nutmeg.
I used over a cup of loose Thai tea leaves and a bunch of sugar with about 10 cups of water.
First let the water boil then add the tea leaves, spices and sugar to simmer for at least 20 minutes.
Let it sit off the heat for 30 mins.
Strain into a heat proof container ( I used flour sack cloth to strain through a colander into a bowl).
Let it cool to room temperature then place in a pitcher.
Serve over ice with half and half, cream or evaporated milk.
You can also make it less sweet initially and then use condensed milk.