How do I remove water spots from my kitchen table ?

Metal polish.

There are several methods to try. Here's a link with more information:

https://www.bobvila.com/articles/how-to-remove-water-stains-from-wood/

Check this out: https://lifeasmama.com/7-ways-to-remove-water-burn-marks-from-your-furniture/?epik=dj0yJnU9TGdlWFJyUTJhbDhFeXYzMWdha3JicUdMQi1rUzZtWnQmcD0wJm49U29nOW1LenU1T2dpdURZd2h5RDRuZyZ0PUFBQUFBR0hzWnZ3

The method that worked for me was an iron (do not use steam), place a towel over the water marks and iron for 10-15 seconds. Repeat until it is gone checking the progress.

I’ve seen someone iron out with a warm iron and a damp pressing cloth but I’ve never tried it. I’m guessing it’s a wooden surface.

Regular Toothpaste

Regular toothpaste (not gel toothpaste) contains very fine abrasives and is a simple, yet effective way to eliminate white water marks on wood furniture.

1. Slightly dampen a rag, apply a little white toothpaste.
2. Gently rub into the spot.
3. Dampen the rag again to remove the stain and any remaining toothpaste.
4. Re-polish as you usually do.

Lemon Juice/Vinegar and Salt

Lemon juice and vinegar are mild acids that help to dissolve mineral solids.

1. Simply mix the lemon juice or vinegar with salt to form a paste.
2. Rub over the white mark using a circular motion until the stain is gone.
3. Use a damp rag to clean up any left over residue.
4. Polish thoroughly to restore the original luster.

Apply Heat from a Dry Iron

I was skeptical on this remedy, but it really does work. The heat softens the minerals enough so you can wipe them away. Any remaining water in the finish is evaporated away.

1. Plug it in and set it to medium high. Do not use the steam setting.
2. Get a clean lint free rag and place it over the stain.
3. When the iron is hot, run it over cloth covering the stained area for a few brief seconds.
4. Pick up the rag and check the stain, repeat until the mark is gone.
5. Add polish or wax when finished.

I've heard that you can use mayonnaise and a soft cloth. Rub the mayo into the wood with the soft cloth and then buff.

I've done this with great success: https://www.exquisitelyunremarkable.com/2016/04/how-to-remove-water-stains-from-wood.html

This may help: http://happyhouseandhome.blogspot.com/2013/09/how-to-remove-water-rings-from-wood.html?m=1

Mayo. Spread mayo and put plastic wrap on top, leave overnight and wipe off.

I assume the table is wood... a light sanding may help or perhaps re finish the top.