Drinkable freshwater is not distributed evenly around the globe. There are larger and smaller quantities at different locations around the world. Freshwater is most concentrated in surface water sources such as lakes and rivers. It can be found as groundwater just the same.
85% of the total water on earth is from the 28 largest lakes. Lots of these lakes are found in North America and Asia. 25% of the total volume of the world's lake water is found in Lake Baikal located in Russia.
The distribution of runoff, extra freshwater that flows out of rivers, is also concentrated in the places it's found. In South America and Asia near 56% of the world's runoff occurs. Australia only contains 1% of the world's runoff, Europe 7%.
It is harder to measure amounts of groundwater than water from lakes and rivers though it is a good source of water. In many places the rate of water pumped from the aquifers override the rate that the aquifers are replenished by water sources such as rain, floods, etc. In areas with that problem the water table decreasing because of overuse. Saudi Arabia's aquifers, for example, are so overused that it is more expensive in that country to pump out water from their aquifers than it is to remove salt from sea water.
*Acid Rain--Rain that is slightly acidic due to the chemicals, such as exhaust from cars, etc.. that has been mixed with water vapor and precipitated as acid rain.
*Aquifers--A formation of rock that is deep underground that has water within it.
*Water Table--The ground flat land underneath the ground where groundwater is found.