The formation of stones in the kidneys is the result of defects in the general metabolism. They usually occur when the urine becomes highly concentrated due to heavy perspiration or insufficient intake of fluids. They are aggravated by a sedentary life-style.
Other than contemporary treatment there are many other home remedies for kidney stones
1)Patients with kidney stones should avoid taking too much milk because of its high calcium content. This a good home remedy for kidney stones.
2)For kidney stone treatment, drink lots of water and other fluids.
3)Limit the amount of calcium-rich foods—milk, cheese, butter, and other dairy foods. Thjis is another good and effective home remedy for kidney stones.

There are some sites which provide free home remedies for kidney stones...