Which is healthier, drinking water, glass, thermos cup, ceramic cup or teapot?

Purple clay pot is suitable for making tea at home, and it is a top grade. Ceramic cups are suitable for drinking water to make tea, and there are no harmful substances, but they are not easy to carry. It is harmless to drink water from a glass to make tea. Recently, Secretary Dakang's glass is very hot, so it is convenient to go out. Hot water bottles are more suitable for drinking water. According to different materials, cheap thermos cups filled with boiling water are easy to produce harmful substances.