Streams may start with runoff or water seeping out of a spring.
Lakes and streams are sources of drinking water.
Water seeping out of a spring is a source of drinking water.
What is a source of drinking water?

  * ice expanding in rock openings
  * helping to prevent floods
  * industrial runoff
  * it helps plants in growing
  * Water seeping out of a spring
  * salt water
  * polluted water
  * Something with a head, thorax, and abdomen