Personal Power Plant (Nanoware)
Cost: Expensive

For gatecrashers worried about being trapped on an exoplanet with no source of food, this nanoware system provides a solution. The nanobots in this system are powered by the isotope gadolinium-148. They transfer this nuclear energy to the body so that it is absorbed in a safe and consistent manner. This effectively fuels the body without the need to eat. With a half life of 78 years, the character can go for a century and possibly longer without regularly eating. A tiny bit of food consumption is still necessary to replace cells, though a small food stash could literally be stretched out for years. Likewise, vitamin and protein supplements would be necessary for long-term health, but as an alternative to starving to death, the personal power plant cannot be beat.