sometimes
Bahrain
No 90% of there water is poisonous.
87% of the world's fresh water supply is used in agriculture -- mostly to water crops.
Yes, the poor in Rome had a fresh water supply. There were numerous fountains all over the city where water was free for the taking.
"The Antarctic Icecap is the largest supply of fresh water, representing nearly 2% of the world's total of fresh and salt water." Source: http://www.infoplease.com/ipa/A0004674.html
The total amount of Earths total water supply that is usable fresh water is less then two percent. The rest is salt water or pond water.
Unlimited supply of fresh water
canada
Evaporation.
Mostly
You can find the nearest underground spring for fresh water supply by contacting local water authorities or conducting a geological survey of your area.
Roughly 2.5% of Earth's total water supply is usable fresh water, with the majority of it locked up in glaciers, ice caps, and groundwater.