The small bowls lack adeqaute filtration, and do not come close to simulating the native waters of these fish. While they may be found in small amounts of surface water, these areas are bogs--the entire bog area is a filter for all of the water within it.
For a tank that small, you may be able to have a couple of the smaller killie fish--but it would require daily attention. The other concern would be heating--no heater will work on that small a tank. If kept in a tank that is warm with a steady temp, the killies would be okay.
However, I would probably set it up with a plant and a snail or 2-3 shrimp (if covered).