As a previous poster, we canoe camped and used a General Ecology filter NBC rated (nuclear biological chemical). W started out with a CX90 and graduated to a two or three filter system for all water going into our teardrop (16 gallons). The first is a Dalton ceramic particle filter and a carbon block good down to .5 micron. Both have silver embedded to prevent bacterial growth. If concerned I can add a General Ecology (that NBC thing). The Dalton gets scrubbed after use and can be dunked in a chlorine bath.
The no filter thing, Filling up our 16 gallons at an Ohio state park, the ceramic filter turned brown, likely silt but would you want that in your water tank.