How did things like laundry/food/hygiene logistics work for each army in the war, both during combat and behind the lines?

Hi,
I know it is pretty late in the series, but I realized i never posted a question from my membership level, so here it goes and hoping it makes it into one of (presumably) the last foxhole videos.
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Fior the various armies at the fronts, how were things like laundry and hygiene processes managed? Were there dedicated groups of soldiers/ mass units dedicated to these tasks or did every individual have to carry and clean their own clothes all the time on their own schedule? Did this vary by nation and/or combat status of the unit? Were replacement uniforms readily available in case of damaged or destroyed ones?

Thank you so much and amazing series!