Besides, boiled water is definitely drinkable. If you want to go to the classroom, use a cup that can be covered. If you want to be more convenient, you can buy a cup with a strainer, so you don't have to drink tea all the time. (I've been drinking tea a lot recently, and I bought a special cup for drinking tea, hehe ...)
Yes, the first course is to wash tea, just rinse it with boiling water, 5- 10 seconds!