Fill a small glass jar with water from a pond, lake or stream.
Add a clump of soil from near or in the water source to the jar.
Place a boiled rice grain in the water to grow bacteria for protists to eat. After a week, protists will begin to grow out of the soil.
Take a drop of water from near the soil at the bottom of the jar. Place the drop onto a microscope slide.
Examine the slide under a microscope to see the protists in detail.