The problem with hydrogen isn't where to get it, the problem is, where to get it economically. It takes HUGE amounts of power to get the hydrogen tos eperate fromt eh oxygen in water to release the hydrogen. It takes a LOT more energy to create the hydrogen than is released by burning the hydrogen. NOT the way to go at all.
So, you could have 2 flywheels counter-rotating. The bigger problem is, I would not want even a gallon of gasoline converted to kinetic energy in flywheels buzzing around between my legs. Flywheels are useful for regenerative braking, but totally impractical for storing any serious amount of energy.
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