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Detail of the helmet's feedport.

Some contingency plans call for the astronauts to be in their pressurized suit for an extended period of time (e.g., if the command module were to lose pressurization). In such cases, the feedport's cover would be removed, exposing an opening through which food and water could be passed without losing suit pressurization (see the Apollo Lunar Surface Journal for additional information).

At the other end of the digestive system, the astronaut can wear a urine collection and transfer assembly, which attaches to the suit's urine transfer connector (underneath a flap on the upper right thigh) so that the urine can be drained from the suit.

The "Waste Management System" chapter of the Biomedical Results of Apollo contains a detached, scientific description (in typical NASAese) of how waste collection worked, while this interview with Rusty Schweickart gives a more, um, "candid" description.