The MRE-OS (Onboard System) is a recent improvement over the old MRE-FT (Feed Tube) which required the soldier in the field to prepare the MRE then connect it to a special fitting to consume without opening the suit. The MRE-OS includes 3 servings of food, water and a dental gargle for after meal freshness. The (backpack option has) a fitting to the MRE-OS allowing additional nutrition for long missions in hostile environments. The quality of the individual MRE's has not however been improved.
As with all Battle Dress Systems, though not often discussed, there is a standard waste reclamation and elimination system. This extracts all the water from the waste for reuse and holds the dry waste as compressed ash pellets for later disposal.