If you are lacking a particular nutrient in your diet, then the best way to prevent a deficiency is through food. Occasionally, supplements may be required (for example during pregnancy or people with medically diagnosed deficiencies), but in most cases supplements can't replace a healthy diet.
If you are low in potassium, the best way to increase your intake is through foods! Not only will food increase your potassium intake, it will also increase your intake of heaps of other important nutrients, like essential vitamins and minerals.
What foods are high in potassium?
Great sources of potassium are most fruits and vegetables, particularly leafy greens, potatoes, tomatoes, pumpkin, legumes, bananas, oranges, dairy products, and nuts.