true most bugs we have got acclimatised to, gippy tummy is the odd ones we havent got used to and why we get the trots on holiday.
if the food is cooked properly then a few bacteria wont make much difference. most soldiers will tell you that going in the field youre lucky if you can find anything to wipe your hands on let alone wash with. at most some pack wet wipes or dew wash with a bar of soap generally relying on the mess tin bath every few days to sort themselves out. you rely on not chewing your nails and having a strong constitution. if kim and aggie ever did how clean is your mess tin then they would faint as we just didn't get enough water for housekeeping purposes
people are obsessed with bacteria when its not like we can avoid them and when we try to we increase problems like childhood asthma and allergies.
scout camps we have hand washes next to the elsans which are normally just soapy water followed by air dry. not perfect but hopefully enough to avoid problems.
an old guy I used to know used to tell me the 1 square of paper technique where you fold it into quarters and tear the middle bit out. you then wipe getting smaller with each pass then use the middle bit to clean your nails