The finished and brewed Thai tea mix keeps well in the fridge. Brew the tea, strain, and then chill, storing in the fridge until you are ready to serve. This can be done several days ahead of time. The brewed thai tea lasts about 10 days in the fridge (without the half and half).
The boba needs to be used fairly soon after cooking. You can keep them in warm water for a few hours to keep from hardening up as quickly, but they are best if eaten soon after cooking.
Note 1: Cooking Tapioca Pearls (this is roughly how our tapioca pearls instructed how to cook- manufacturers will vary on how their product is meant to be cooked):
For 1/2 cup of uncooked pearls, bring 3 cups of water to a boil. Add pearls and cook for 20 minutes on a low boil. Turn off heat, cover the pan and soak for 25 minutes in the hot water. (During last 25 min soak time, adding a sweetener like brown sugar or honey will infuse the boba pearls with a rich flavor.)
Strain and rinse. Keep in warm water until ready to serve (use within a few hours of cooking).