My textbook [Chemistry Live, Declan Kennedy] states that ''During WW2 small ion exchange resin columns were part of a soldier's survival kit.''. I can't find any further info about this online or elsewhere. The chapter is on water purification and hard/soft water.
My thoughts are to either 1) to aid purification of urine for consumption 2) to remove ions from water that has been poisoned 3) to purify water that may be polluted due to all the metal waste (bullets, shrapnel, etc.)
Can anyone confirm the actual reason that soldiers carried these kits ?