On a recent trip we used our collapsible water bucket (a Seattle Sports ‘super sink’) to carry and treat drinking water for a group of nine. The collapsable PVC sink holds six gallons and weighs only 4.5 ounces. Carrying six gallons of water from lakeside to campsite for chemical treatment or filtration is much simpler than treating or filtering a number of small bottles. Also makes a great washbasin for dishes or faces.
Seattle sports also makes a pocket bucket and a camp bowl in the same collapsible design.