Electrolytes have become synonymous with sports drinks and supplements you can buy, but plenty of foods naturally contain these important minerals. Electrolytes - including potassium, magnesium, calcium, sodium, and chloride - help maintain fluid balance, muscle contractions, and nerve signaling throughout the body. Here are some of the best natural food sources of electrolytes for everyday hydration while swimming at the lake, taking long summer walks or if you're just trying not to melt into a puddle in the sweltering heat! Potato It turns out that potatoes are quite packed with electrolytes. In fact, a medium-size baked potato with skin contains about 900 milligrams of potassium . Bananas are well-known for being rich in potassium, but a medium banana has less than half the potassium of a potato. Potassium helps regulate fluid balance, helps nerve impulses, and is important for normal muscle contractions and heart function. A medium baked potato with skin contains...