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Wow....read up on hydrogen fuel-cells.
They don't split H2 or 02. They TAKE hydrogen (from a fuel-pump) and oxygen (from the air). They then combine the 2 together (in a chemical process with heat and some catalyst such as platinum. The result is water (H2O) and energy. The water is pure. The only other waste is the catalyst, which is akin to a chemical battery and can last quite a while before needing to be replaced (recycled).