i agree with jayca... in order to prevent kidney stones, learn to live a healthy lifestyle. means you need to avoid fatty foods and most important salty ones. as much as possible  if you can, to stop using salt in your food. the better. just use herbs.

of course, you have to drink more water. you can also try drinking cranberry juice as it helps also. and more vegetables and fruits.

hope this helps you....

~smile always, life is beautiful~