One is so-called tunnel surgery. Its medical name is percutaneous nephrolithotomy. The surgeon makes a cut in the patient's back and tunnels into the kidney to remove the stone. The second uses a ureterscope to come in via the urethra to find the stone and pull it out. Up to 12 glasses a day is recommended.
Water helps the kidneys flush things out of the system.
Talk to your doctor. If you've had a stone or maybe a family history, your doctor may want to make some dietary suggestions. Consult a qualified healthcare professional who understands your particular history for individual concerns.