1. Wipe up the excess water with a dry cloth or paper towel.

2. Mix a solution of equal parts water and vinegar. Dip a clean cloth into the solution and wring it out.

3. Place the cloth over the water stain and let it sit for about 10 minutes.

4. Remove the cloth and rinse it with plain water. Gently wipe the area with the damp cloth.

5. Dry the surface with a clean, dry cloth.

6. If the stain persists, use a marble cleaner specifically designed for removing stains. Follow the instructions on the product label.

7. Once the stain is removed, seal the marble countertop with a good quality sealer to prevent future water stains.