[Spaceships] Total life support

[Fish]

On the other hand, it is not impossible to imagine certain safety regulations for starship design, in a sufficiently robust starfaring culture. This might not equate to "full life support," but to something like

Originally Posted by White Star Spacecraft Ltd Regulations Manual, p. 217

HEALTH AND SAFETY
In accordance with Galactic safety protocol, minimum essential foodstuffs must be provided by the Carrier not to be fewer than two (2) days food, water and atmosphere for each crewman and passenger for intrastellar voyages, and not fewer than five (5) days food, water and atmosphere for interstellar voyages.