What is the best way to prevent kidney stones?

Fluids: The best way to prevent the formation of kidney stones is to be sure to always drink plenty of water to avoid dehydration, and to avoid excessive calcium, with a maximum intake of 2000-2500 mgs. Per day.

Water + low salt: Drink lots of water, 2 quarts, all day and avoid dehydration. Low salt diet is both healthy and reduces calcium excretion. Calcium is filtered by kidneys together with salt. Avoid excess red meat. Calcium intake, according to recent studies doesn't seem to matter. However probably good idea to avoid xs milk or cheese.

Fluids + low salt: Drink 2 litres of water daily, this will keep you well hydrated and keep urine dilute thus calcium excreted by kidney less likely to crystalise + form stones. Low salt diet is 2nd most important feature as urinary calcium excretion is associated with salt excretion. Avoid xs red meat in diet. Moderate calcium in diet is fine and is not related to stone formation. Xs calcium may be. Ie healthy diet.