kidney stones can be caused by many things, usually lack of water, too much caffeine, and a surplus of calcium. PH and creatine cause the shunting of water to the muscles, do to increased glocogen or other reasons. if you do not increase fluid intake appropriately then u will be in a dehydrated state. excess protein intake also cause dehydration.
you can take some magnesium citrate if they are calcium stones. citrate keeps calcium from bonding. measure your water intake.