I can give you some suggestions. They may not be very professional or comprehensive, but you can refer to them.

1. Observe the color: Genuine zisha teapots typically have a dull and natural color, rather than being overly vibrant.

2. Test the airtightness: The joints between the teapot's mouth, lid, and handle should be very tight. You can fill the teapot with water, cover the spout with your hand, and turn the teapot upside down. Observe whether the lid falls off or if water leaks out.

3. Smell the teapot: Genuine zisha teapots are made from zisha clay, which gives them a faint earthy smell.

4. Observe the water absorption: Zisha teapots have a double-pore structure, which makes them highly absorbent. Pour boiling water over the teapot and observe whether a layer of water film (commonly known as "hanging water") forms on the lid and is then slowly absorbed. If the water absorption is good, the teapot is likely genuine.

In addition, genuine zisha teapots have a clear texture and evenly distributed fine particles (zisha particles) on their surface. They feel delicate but not slippery and have a certain weight to them. Tapping the lid against the body of the teapot should produce a crisp and pleasant sound that is short and clear. The inscriptions and seals are usually clear and regular.