Note by moderator: A related thread about sanitation for the homeless in the US is here:
forum.susana.org/180-urban-informal-sett...e-homeless-in-the-us

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I live a few blocks from some camps in Seattle and have put out some kits with simple 5 gallon porta pottis. Very low tech but I don't need anyone's permission to put them in (an unfortunate requirement) and they are relatively simple to maintain. They last about a week for 5 or 6 people assuming people do some of their business when they are not in the camp.

I'm using them as a springboard to get this issue local attention, plus I get to help a few people out of the thousands in unsanctioned encampments that do not have minimal sanitation.