What lifestyle changes can I make to help prevent kidney failure?

Exercise. Maintain a healthy lifestyle with low fat food, low salt diet. Avoid excessive weight gain. Stay well hydrated. If you have diabetes or high blood pressure, make sure it is well controlled. Exercise is important to improve all of these factors. And see as doctor regularly. They can do blood tests to check for kidney disease since this is often a silent disease.
Ideal weight needed. Also, no smoking and exercise almost daily but in moderation e.g. Daily half to one hour walk. Of importance is to control any chronic disease you may have with adequate med care.