When you use it for doing dishes and showering, theres not enough time for "drip drip drip". We use about 30 gallons every 2 or 3 days and i like to just get it over with. For a mobile or temporary setup, id definitely agree with youA Millbank bag and either a Sawyer mini or chemical treatment would be my first choice, providing a compact, passive, effective method without the need for electricity. Interesting idea though.