Neat ones -- I'll definitely have to remember those smile Plastic trash can sometimes be found in the most remote places; other fine-weave cloth (for example, nylon or spandex) could probably fill in for Sari; and the sand filter sounds like it would complement the artesian concept nicely (it'd just require a larger, slower moving seep to give bacteria time to clean it; you'd probably have to mulch the top with dead grass or gravel to lower evaporation).