When trying to prevent or pass kidney stones you should be drinking a lot of water (more on that later), and adding lemon juice is a great way to make your water taste better and more effectively prevent stones from forming. This is because lemons contain the chemical citrate, which helps prevent kidney stones from forming and breaks up small stones so that they can pass more easily. You can also drink a mixture of lemon juice and olive oil. While it may not taste amazing, olive oil also helps flush kidney stones out of your system. Just mix one-quarter cup of each together with some water, and drink until your symptoms ease. Side note: make sure you only use fresh lemon juice and pure olive oil, as added sugars can exacerbate kidney pain.