First, any burned hydrogen turns back into water. Second, with the amount of water on the planet there’s no chance we’d use it all but we can deplete drinkable water in certain areas. Third, hydrogen fuel (not thermonuclear) is not a source of energy, it’s a way to store energy. You spend energy to turn water into hydrogen and then reclaim this energy (minus all losses) when you burn that fuel.
When you burn hydrogen as fuel, you combine hydrogen and oxygen, resulting in some energy and some water.
Fun fact: using any hydrocarbon as fuel (methane, propane, gasoline/petrol, alcohol, wood, etc) results in water being produced, because the chemical reaction is combining oxygen with the fuel, and some of the hydrogen in the hydrocarbon reacts with some of the oxygen, resulting in water. Of course, plenty of other compounds are also produced, many of which are dangerous to health, but there’s water being produced too.
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