During severe supply shortages in World War II, military medics in the Pacific theater occasionally turned to young green coconuts as a last-resort substitute for standard intravenous saline solutions. Because the liquid inside an undamaged coconut is naturally sterile and packed with essential electrolytes like potassium, sodium, and magnesium, it could be siphoned directly from the fruit to temporarily hydrate wounded soldiers and maintain blood volume until proper medical supplies arrived. While modern medicine relies on carefully balanced pharmaceutical IV solutions due to coconut water's relatively high potassium and low sodium levels compared to human blood, this wartime innovation stands as one of history's most fascinating examples of emergency battlefield resourcefulness.