Hi,
About kidney stones:
*Normal subjects can excrete more than 10 to 15 liters of (very dilute)urine per day, hence drinking even large amount of water in persons with normal kidneys will not lead to hyponatremia (low serum sodium). This can rarely occur in few patients who chronic psychiatric disorders.
*Kidney stones occur most commonly due to genetic predisposition leading to various metabolic abnormalities. In these individuals one of the ways to prevent stones is to ensure adequate urinary flow and avoid crystallization. This can be achieved with drinking at least 2-2.5L of water per day, but there is no need to drink 6-8L per day (though this will not harm apart from excessive urination). This is more imp. in summer (as more sweating may lead to dehydration ind increased risk of stone formation).
*Alcoholic beverages do not have increased risk of stone formation but no any particular drink is routinely advisable to avoid the stones.
*Limit salt intake.
*This is misconception that calcium containing products to be avoided, infact its intake should be normal.