Hungry? Then just add filthy water... or worse.

Food scientists working for the United States military have developed a dried food ration that troops can hydrate by adding the filthiest of muddy swamp water or even peeing on it. The ration comes in a pouch containing a filter that removes 99.9 per cent of bacteria and most toxic chemicals from the water used to rehydrate it, according to the Combat Feeding Directorate, part of the United States Army Soldier Systems Center in Natick, Massachusetts. This is the same organisation that created the "indestructible sandwich" that will stay fresh for three years. The pouch—containing chicken and rice initially—relies on osmosis to filter the water or urine.