Some technologies that people have come up with to increase water availability are digging up wells, collecting rainwater, and and removing salt to get fresh water. 

Water vapor in our atmosphere condenses into clouds and then falls as precipitation. 

Transpiration is the process that allows for water in a plant's body to be lost back into the atmosphere. 

The water cycle is "powered" by the Sun's energy. 

Most of Earth's water is Saltwater and found in the oceans.