• hydrological cycle [evaporationl condensation; precipitation ; interception ; infiltration ; percolation ; transpiration ; runoff ; storage ( atmosphere , surface , ground ; advection )]
• water use basics [drink high , wash low, pee away]
• ideal water [source; clear ; fast ; upstream; no animal carcasses / feces ]
• contaminants [ turbidity ; chemicals ; heavy metals ; bacteria ; protozoa ; viruses ]
• aeration
• fluid retention [ cool ; shade ; contact ; digestion; nasal breathing ; sipping]
• rainwater catching [ sizing ; timing ; roofing; downspouts ; delivery systems ; foulflushes]
• rainwater storing [ sizing ; cisterns ; barrels ; bungholes; bulkheads ; freeze mitigation ]
• solar disinfection
• distillation & solar stills [cloche solar still; panel solar still]
• dew catching & fog netting
• swales & ponds
• particle filtration [ slow & rapid sand filters ; cloth filtration in lashed tripods ]
• seepage basin
• [ activated ] charcoal filters
• earth filter [ sand - grass - charcoal - rock - corded birch bark funnel ]
• portable filter use [e.g. Katadyn portable filter , Aquamira Frontier Emergency Filter ]
• stationary filter use [e.g. Big Berkey water filter ]
• chemical treatment [ chlorine ; bleach ; iodine ; potassium permanganate ]
• boiling [ hot rock v. flame]
• in-ground clay basin for boiling w/ hot rocks
• transpiration bags
• water-possessing plants [e.g. grapevine ; plugging in dripper stick]
• water witching [ rural & wild ]
• primitive well digging
• wastewater recycling [ greywater ; blackwater ; wetlands ]