There's a ton of sugar in a Thai iced tea. And if you try to cut down on it, it definitely won't taste as good. I made the recipe multiple times, with less sugar, but it just didn't taste the same as the ones in Thai restaurants.
The black tea isn't absolutely necessary since there is black tea in the Thai tea mix but adding it definitely made it taste better.
To make the drink truly authentic, use crushed ice instead of ice cubes.
I've tried swapping out the evaporated milk with other kinds of milk but it didn't have the same restaurant-quality taste. Stick with the evaporated milk.
The Thai tea can be made ahead of time and stored in the refrigerator for up to 4 days. When you're ready to drink, just add in the condensed milk and evaporated milk.
The food coloring from the Thai tea mix stains LIKE CRAZY. If you spill even a drop, make sure you wipe it up quickly.