The best thing to maintain kidney health is to take care of your body and reduce chances of developing diseases that put a pressure on your kidneys.
To prevent kidney stones, you need to understand what caused it in the first place. Kidney stones are solids that form when substances found in the urine become extremely concentrated. Common early signs are high levels of calcium, oxalate, and phosphorus in the urine.
The best prevention is to make sure you drink plenty of water and avoid becoming dehydrated.
It is essential to keep your urine diluted to avoid waste products forming into kidney stones.
So, what is the best way to treat and get rid of kidney stones? Add lemon to your water! 
This is a natural treatment that general nephrologists have gotten right. While lemon water is often used as a cleansing or alkalizing drink, the main reason it is helpful in reducing stone formation is its citric acid content.
The citric acid in lemons inhibits the stone formation and breaks up small stones that are starting to form. The more citric acid in your urine, the more safe you are against building new kidney stones.
Citric acid makes urine less favorable for the formation of stones. It stops small stones from becoming problem stones by covering them and preventing other material from joining and building onto the stones.
Lemons and limes are full of citric acid. Pharmacological doses of citric acid, prescribed as potassium citrate, are useful in the treatment of kidney stones. However, some medications may be costly and require as many as 12 tablets daily.
A half-cup (4 ounces) of pure organic lemon juice per day or 32 ounces of prepared lemonade give about the same amount of citric acid as does pharmacological treatment.
Dilute 2 ounces of lemon juice with 6 ounces of water and drink twice a day, once in the morning and once in the evening, to reach the goal of 4 ounces of lemon juice per day.