Water contains two elements, hydrogen (very explosive) and oxygen, which can make almost anything burn. You’d think tossing a match into a body of water would end all life, for the amount of stored Oxygen and Hydrogen. It won’t because it is essentially ash. Inert. It takes a large amount of energy to separate the Oxygen and Hydrogen from each other, before either could be used again. That is the problem. That’s why we don’t pour a gallon of water into a tank and head across country.