Hydrogen production from water has been possible for several decades; although it is currently much more cost efficient to produce it from hydrocarbons.
There are several different ways to produce it from water.
Simply heat water to 2500 degrees C (4532 F) and it spontaneously dissociates, separating hydrogen from oxygen. Building the pipework and control systems to handle the high temperature is the costly part.
The US military has also been making hydrogen for balloons since WW1 using ferrosilicon, hydrogen peroxide and water.
Like everything else, while we have cheap fossil fuels, other technology cannot compete.
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