‘Gris’ is a low-tech greywater-system for Third World Countries which can collect all the water you use during a shower.
You can use this collected grey water for flushing the toilet, cleaning the house and for certain washing activities. This way you can save at least 72 liter water/person/day in an average household which means at least 1.5 billion liter saved water per day in such an 50 million habitant country like Colombia.
The other big problem is that due to climate change in South-America the dry season in the last decades became longer and dryer that is critical, because it leads to serious social conflicts. In many smaller towns and villages the water network is supplied by local water reservoirs and when there is very few rain the water resource decreases.
It occurs many times that farmers who lives closer to the water reservoir hijack the water flow to give water the animals – however it is unethical to the community but if their animals die the farmers will starve to death either. This creates such hard to solve conflicts that endangers whole communities.