Amoebas.
If you were to look at a drop of unfiltered water under a microscope, you would probably see a thing that looked like a blob of jelly. And after a while you might see the thing moving. The thing you saw might have been an amoeba, amoebas are tiny one-celled invertebrates that live in water. Amoebas do not have an actual shape of their own but sometimes they look round. When amoebas move, they change the shape of their bodies to help propel themselves along in the water. When they change their shape, they move a little bit, so they have to repeat it a lot of times to actually get anywhere.
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