Please review this image.
Already
very familiar with it. Much more so than you are, it would seem.
I'm imagining putting food, water, fuel, parachute, 3 men and instruments in a room this size and I don't see much room for the astro-nots to move around.
The Apollo CM
was cramped. But the astronauts reported that it subjectively became a lot roomier once they were in weightlessness, as they could use its internal volume much more fully.
However, as you would know if you'd actually studied this diagram, water, fuel and parachutes were
not stored inside the relatively small inhabited volume of the CM.
The parachutes were packed around the docking tunnel, outside the pressurized inhabited volume.
Water was produced as a byproduct of the three hydrogen/oxygen fuel cells. The fuel cells and reactant storage were all in the service module, not the CM. See that big cylindrical thing behind the CM? Notice how much bigger it is than the CM?
Nearly all the rocket fuel was also stored in the SM; see those huge cylindrical tanks labeled "fuel tanks"? Only the small amounts of fuel needed for attitude control during re-entry were stored in the CM, and those tanks were around the outside of the CM just above the bottom -- again, outside the pressurized, inhabited volume of the CM.
You can even see actual Apollo CMs for yourself; they have been on display in museums around the world ever since they flew. The most famous CM, that of Apollo 11, is in the Smithsonian Air and Space Museum in Washington DC but there are many others.