Remove water stains from wood furniture without refinishing using mineral spirits or denatured alcohol to rub the stain. Work in a well-ventilated area. If these solvents do not draw out the water, the other option is refinishing the wood.
Begin the process by applying mineral spirits with a soft white rag. Many times, the white ring left by a wet glass or spill on wood furniture is due to wax that absorbs the water. The mineral spirits dissolve the wax to remove the stain. Once the stain disappears, you may need to clean the entire surface and apply a new coat of furniture wax if the area has a dull appearance.
Alcohol also helps to remove the water from the finish, but it works slowly and can damage some surfaces. Always test the alcohol in an inconspicuous area before applying it to the stain. Continue rubbing the spot for about five minutes.
If the stain extends into the finish to the point that you must remove the finish, the piece requires refinishing. Choose a wood stain that matches the existing finish, and apply it with a brush. Apply the stain, let it sit, and wipe away the excess. Continue the process until the repair matches the surrounding area. Apply a new coat of the finish over the repair.