Hi Mady, here's an article that you might find helpful.
hometalk has this idea:
Mayo or toothpaste works leave on for 20 min then rub off
Try making a paste of olive oil and salt. Put it directly on the water rings. Let it set for at least one hour. Then wipe it all up. The salt will pull out the moisture and the olive oil will condition the wood.
Hi, Mady - this is what I do: https://thehowtohome.com/remove-water-stains-wood/ Simple and easy!