How to preserve tea taste for 6-7 hours? I am new to this site and I hope my question is clear to everyone.


I prepare 4 cups of black tea in the morning by bringing water and tea powder to boiling.
Then I pour this into flask by filtering tea powder.
Whenever I feel like drinking tea, I pour black tea from flask, add sugar and milk and heat it for 1 minute in microwave.


I noticed that tea taste is changing from fresh prepared tea to 5 hours after.

Is there anyway to keep the same taste? I don't want to prepare tea every time I want to drink.
Have you considered investing in a good (read: expensive) insulated flask that is rated for 6+ hours and hot liquids? As long as you only open it long enough to pour your cup out, it should keep it at a drinkable temperature and (hopefully) not spoil the taste like reheating does.

If you do this, you should heat your milk separately so it doesn't cool down the poured tea.