Miner's short summary of the use of acid to increase the antimicrobial action of ordinary household bleach is good for laboratories and spaces with lots of ventilation. Or, folks equipped with masks which prevent free chlorine from entering the lungs.
I would not use bleach and acid mixtures in a confined space such as a V berth without serious protection of my lungs.
Diluted, as the later posts describe, the bleach concentration is much reduced, which is much safer.
Anyone using these mixtures with acid or vinegar added to bleach solutions should test them outdoors in a well ventilated area before going further. Once you have had a significant exposure to a gas such as chlorine or sulfur dioxide or similar, the effects can last for days, weeks. Been there, done that. Do not recommend the experience to anyone.