What kind of fish/creatures can live in an unheated unfiltered fishbowl if I do regular water change

I have a bunch of little aquariums/fishbowls but the only creature I can find suitable for these living environments are betta fish. They are mostly around the size of one-gallon, unheated, unfiltered tanks. I know no tropical fish would work but I have a zebra danio in one and it is doing fine. ( I know they're supposed to be in groups.I'm working on a way I can get him friends without giving him away). I have guppies in a ten-gallon heated tank - could they work in the smaller tanks? Please don't tell me to put goldfish in the bowl - I hear it's cruel. I'm thinking of something along the lines of white cloud mountain minnows and ghost shrimp. If I do get the white clouds, how many could I keep in a one gallon? Will these work? Any suggestions on other fish?

Welll..since ya asked(smile,lol)

The best fish for a bowl that size is a male betta. The most common fish that people want to put in a bowl is goldfish. But, they need a tank of at least 10 gallons with a filter. Most die a horrible death in a few weeks or less because they are so messy and get so big. (They grow to be about 8 inches.) Bettas are by nature suited to live in very small bodies of water and stay small. One gallon is the minimum size for good health. I think yours holds about 2 gallons so you are in good shape.

However! Bettas. are from the Anabantidae Family are a of perciform fish commonly called the climbing Gouramies or climbing perches. As labyrinth fishes, they possess a labyrinth organ, a structure in the fish's head which allows them to "breathe" atmospheric oxygen. Fish of this family are commonly seen gulping at air at the surface of the water; which then passes out of their gills or mouth when they dive beneath the surface.