There's many ways to store hydrogen ranging from 'cryogenic' to 'dissolved in ... (acetone is a good candidate)' to 'converted to ... (ammonia et al)' to 'compr

There's many ways to store hydrogen ranging from 'cryogenic' to 'dissolved in ... (acetone is a good candidate)' to 'converted to ... (ammonia et al)' to 'compressed'. Ships (can) have a lot of space so that is not much of a problem. Cryogenic is probably not feasible, compressed is probably also out but in between there are many options.