Yikes.
That being said, as for soldiers in the game, they wouldn't need it, even present day modern military gear includes stuff that allows soldiers to relieve themselves in the field, as well as eat and drink, even when wearing those bio-suit or hazmat uniform things that cover them head to toe and seal them from the outside (yes, those things that have either air filters or their own air supply.) Don't ask me how they work, as I've never been in one of those things, but I know they have them.