Fuel cells do work, at least in niche applications, using hydrogen fuel.
OTOH ‘reformer’ input stages to use liquid fuel are a problem, perhaps a bit less so for alcohol (methanol) which is not widely distributed in quantity for retail use. Jugs of ‘methyl hydrate’ can be purchased, such as from paint stores.
But the whole hydrogen notion is based on a false theory, not true evidence as aviation is built on.