Mizuya is a Japanese word that means "water room" in English. It's a place where people go to wash their hands and face before entering a formal tea room or any other traditional Japanese room.
You know how you have to wash your hands before dinner? Well, it's kinda like that, but instead of just washing your hands, you also wash your face and sometimes your feet too. It's like a little spa for your body before you go into a special place.
In the Mizuya, there is usually a small sink with a faucet, a wooden bucket, and a ladle (a special spoon for scooping water). You fill the bucket with water and then use the ladle to pour water over your hands, face, and feet.
It's an important part of Japanese culture to be clean and respectful, so washing yourself before going into a formal room is a way to show respect to the people you will be with. It's also a way to prepare yourself for enjoying a special moment with your friends or family.