SPOUTS is a social enterprise providing ceramic waterfilters and improved cookstoves in Uganda and Rwanda: https://spouts.org
Caminos des Agua in Mexico has developed several solutions to obtain access to clean water, such as a rainwater harvesting system, a groundwater treatment system, ceramic filters and bike pumbs for wells: https://www.caminosdeagua.org/en/home/
African Ipod Water provides water refilling stations placed in groceries, where people can buy water by refilling their own bottles so that they do not need to buy plastic bottles: https://www.purewaterpod.com/i-drop-water
Reuse of Water
Grameen Veolia in India provides solutions in terms of watermanagement, i.e. recycling wastewater for industries https://www.veolia.in
Sanitation
German social business Goldeimer provides sustainable services round toilets: providing toilets for festivals (using no chemicals and turning all biomass to humus), toilets for campers, sustainable toilet paper and exploring how to reduce the waste of napkins. https://goldeimer.de