Getting to clean drinking water is still a problem for hundreds of millions of people in Africa.
A boy collecting water in Tanzania
Fetching water, which is usually done by women and children, can involve lots of long journeys on foot.
Carrying water takes up to 40 billion hours a year - time which could be spent at work or at school.
Experts say that more than four out of 10 people still have to rely on water
that could make them ill or kill them.
The World Health Organization estimates that 80 per cent of all sickness in the world can be blamed on unsafe water and poor hygiene.