There are 3 systems great for camp, remote trips, etc.

One is a 2gal drip bag. Fill with water and it drips thru filtration system overnite. Other is a pump PUR, with a unopened extra filter and the 3rd is a personal water bottle with filtration system built into cap. I used these on remote trips in Alaska and local week long river trips! They work very well! In Sandy, $40 cash for all 3.