Trek'n Eat NRG-5 Emergency Food Ration is a compact 500 gram Ready-to-eat emergency food package. This 500g emergency food package covers the daily energy needs of an adult. NRG-5 is ready to eat immediately and does not require heating or cooking. If desired, it can also be mixed with water. When mixed with water, it has the consistency (depending on the amount of water) of porridge or gruel and it tastes like that. When mixed with a larger amount of water, it also works as an energy drink.