Squash is a good source of potassium. Beans are a good source of potassium. Avocado is high in potassium. Kiwis are packed with potassium, an essential mineral that helps the body maintain proper levels of hydration and electrolytes.Yogurt is high in calcium and potassium.elons, peaches, avocados, tomatoes, and bananas are all high in potassium as well, and can be eaten raw, mixed in fruit salads, and included in a variety of dishes. In addition, squash, lentils, and beans have a lot: try roasting squash, or using beans and lentils in a healthy soup.