WATERBORNE DISEASES:
  Cholera: Vibrio cholerae | contaminated water | rice-water stools
  Typhoid: Salmonella typhi | faecal-oral route | sustained fever
  Hepatitis A: faecal-oral | vaccine available | liver inflammation
  Cryptosporidiosis: protozoan parasite | chlorine-resistant | diarrhoea
  
WATER TREATMENT:
  Household: boiling (1 min rolling boil kills all pathogens)
             chlorination (1 drop sodium hypochlorite per litre, 30 min contact)
             filtration (removes turbidity, some bacteria — NOT viruses alone)
             SODIS (solar disinfection — 6 hours sunlight in clear PET bottle)
  
  Municipal: coagulation → sedimentation → filtration → chlorination
  
SANITATION (WASH):
  Water: access to safe water within 30 minutes
  Sanitation: access to improved toilet not shared with other households
  Hygiene: handwashing facility with soap at toilet and kitchen
  
  Open defecation: major disease route | India's Swachh Bharat Mission targets elimination
  ODF (Open Defecation Free): villages with 100% toilet use and maintenance

HOUSEHOLD HYGIENE:
  Kitchen: separate chopping boards (raw meat vs vegetables)
           clean surfaces before food prep
           wash vegetables and fruits before consumption
           store food covered and at correct temperature
  
  Bathroom: clean toilet weekly with disinfectant
             clean sink and taps (high-touch surfaces)
             ventilate to prevent mould
  
  Laundry: wash at 60°C+ to kill bacteria (or use detergent + hot tumble dry)
           separate soiled items immediately
           wash hands after handling soiled laundry

WATERBORNE: cholera | typhoid | hepatitis A | cryptosporidiosis
WATER TREATMENT: boiling (1 min) | chlorination | filtration | SODIS
WASH: Water + Sanitation + Hygiene — WHO global health priority
KITCHEN: separate boards | wash produce | correct temperature storage
LAUNDRY: 60°C kills bacteria | separate soiled items | hand hygiene after
ODF: Open Defecation Free — India Swachh Bharat Mission target