Why do you think a FRH does not come with water already in it?

A FRH, or Flameless Ration Heater, does not come with water already in it because the chemical reaction that generates heat and steam to heat the food inside requires a specific amount of water to be added. Adding too much or too little water can affect the efficiency of the heating process. By not pre-filling the FRH with water, manufacturers ensure that users can control the amount of water added, optimizing the heating performance for the best results.