The water produced from rain, fog and dew most likely, if the enviroment is not polluted, will comply with WHO (World Health Organization) recommended guidelines for drinking water. Nevertheless, the probable presence of small amounts of animal and/or vegetal bacteria (e.g., from the excretions of insects drinking the dew water) may require a light antibacterial treatment like boiling or microfiltration. We are currently developing lost-cost water filtering solutions to embed in the Warka towers.