The amount of water used in the world every day is very uneven. MEDCs use more water than LEDCs - households, farming and industry all demand water.
Water usage of LEDCs and MEDCs
What the water is used for depends on the country.
In general, LEDCs (like Bangladesh and Malawi) will have most of their water used in agriculture (farming) and little in industry or domestic use. Bangladesh has farming as a large part of its economy so a large percentage of their water is used for that purpose.
MEDCs (like the UK) have a more significant use of water for domestic reasons. MEDCs also tend to have a higher percentage for industrial use.
There are exceptions. The USA is an MEDC, but it still has a high amount of water used for agriculture because there is also lot of farming across the country.