Contrary to popular belief, sports drinks are a pretty poor source of potassium, even if you exercise a lot. And supplements are no substitute for real food. If you need more potassium, eat fresh fruits and vegetables and drink milk.
A good lunch might consist of a banana, sandwich, and some veggies.
A high-sodium diet might cause high blood pressure, and that it's important to balance sodium in your diet with potassium. Potassium helps the body get rid of extra sodium and also helps to maintain water balance. Plus, a recent study suggests that eating a diet high in potassium can help prevent strokes.