Answer:
It has the biggest wall and is also used when drinking tea.
A father's child, a mother's child, yet no one's son
Possibly the word most commonly said before taking a sip
Whatβs full of holes but still holds water?
What is found over your head but under your hat?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.