Hygiene & Sanitation Without Infrastructure When the water stops flowing or the sewer backs up, you have about 72 hours before hygiene becomes a health emergency. Diarrheal disease from contaminated water kills more people globally than violence. That's not a developing-world statistic -- it's what happens anywhere when sanitation fails and people don't know the basics. This skill covers what to do when you can't flush, can't turn on the tap, and can't count on the systems you normally take for granted. The information is practical, tested, and drawn from disaster response and field sanitatio…