For a setup that small, you could just use solar power. Put it in a windowsill that does not get direct sunlight, but is still bright. I have a single shrimp in a ~.5 liter container, and so far, no escape attempts.
As far as emersed goes, you could cover the top with plastic wrap and just stick it under a light. Emersed containers seem to be picky about being put outside, possibly due to temps + high humidity