Water in Europe shouldn't be too much trouble for units to come by. Clean water on the other hand...well, that's why there are medical and logistics units with specialist members assigned to cleaning up water prior to consumption.
Water in drier areas such as the middle east could be somewhat more problematic with battles fought over just one potable well....
All in all, a decent soldier should have received training on field hygiene and one of the many tasks of senior NCOs is to ensure these practises are carried out. Facial hair is likely to become more common, particularly moustaches (many members in my unit(s) grew them when in the bush for more than a week or two) as shaving with a blunt razor is somewhat less than comfortable (as we all probably already know).
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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