Electrolytes exist in the form of calcium, chloride, magnesium, phosphate, potassium, and sodium, which can be obtained from drinks, supplements and from your foods. When we lose water and salt through sweating, we need to get that balance restored. If not, our muscles begin to cramp and hurt. If this condition continues, it can disrupt the overall balance and functioning of the nerves and cardiovascular system, along with your muscles. Tablets called Thermotabs offer the benefits of rehydration salts with a small size and long shelf life, while Oral Rehydration Salts powder from Adventure Medical Kits offer quick absorption by mixing them in drinkable water.