If you have a Hydrogen powered rocket, that means you have a Hydrogen engine, right? While having a hydrogen tank on board is ideal, it isn't mandatory, as the engines have their own internal (but small) hydrogen tanks.
Anyway, to fill up a hydrogen tank or fuel a hydrogen engine, it's best to have a O2/H2 generator on board. This will consume Ice and create hydrogen, which is transferred via conveyor belts to the Hydrogen Engine and Tank and will power your rocket. So, on your rocket ship, build one of those O2/H2 generators and get some ice and pop it in. This can act as fuel for your rocket.
Like I said, you can pre-convert the Ice to hydrogen and store it in a tank, but that is optional. I believe your ship's hydrogen engine can depend entirely on the O2/H2 Generator's ice storage.
EDIT: I forgot to mention, hydrogen bottles can only be consumed by your space suit. They are filled by the O2/H2 generator, and the hydrogen tank can also fill the bottles. The hydrogen inside is not usable outside of powering your space suit's jetpack. So unfortunately the bottles won't help you here.
EDIT 2: I should point out that you didn't mention the type of thrusters your rocket uses. If it uses Atmospheric/Ion thrusters, they run on electricity, but if it uses Hydrogen thrusters, then that will run on hydrogen, created with the ice. Consider this, a hydrogen tank might be convenient on board.