Coffee Bar,
Sorry, to hear that your piece has contracted some water spots. This piece, even though it is finished, needs to be maintained. Mineral Oil, is the most natural finish and food safe but does require maintenance. Whenever your piece is looking a little dry, we recommend applying a coat of the Mineral Oil. Doing this and keeping up with it, ensures the protection from outside elements, like water. To be rid of the existing water spots, you can sand and then reapply the mineral oil. Thankfully, wood is a pretty forgiving material.
Thank you! I hope this helped. --Hardwood Reflections