To remove water stains from Engineered Stone kitchen counters, you can try the following steps:

1. Make a paste with baking soda and water. Mix equal parts of baking soda and water in a bowl to create a thick paste.

2. Apply the paste to the water stain. Using a non-abrasive sponge, apply the baking soda paste to the water stain on the engineered stone surface.

3. Scrub the surface gently. Use circular motions with the sponge to scrub the surface gently. Be careful not to use too much pressure as this can damage the engineered stone.

4. Rinse with water. Using a clean, damp cloth, rinse the area with plain water to remove any excess baking soda residue.

5. Dry the surface with a soft towel. Use a soft towel to dry the surface thoroughly.

If the water stain is stubborn and doesnt appear to be coming out with the baking soda paste method, you can also try using a specially formulated cleaner for engineered stone surfaces. Always follow the manufacturers instructions carefully when using any cleaning product.