Chronic kidney disease is associated with high blood pressure, heart disease, and strokes. Potassium lowers blood pressure and may help prevent heart disease and strokes in the general population, but has not been well-studied in people with kidney disease. This study will look at the benefits and safety of two levels of potassium intake in patients with kidney disease. We expect that a higher level of potassium intake safely lowers blood pressure compared to a lower level of potassium intake. We hope that this and other research projects will help us to learn more so that guidelines can be created for potassium intake in patients with chronic kidney disease