This is what I use for a brooder:
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It's just a large plastic tub with holes drilled in the lid. The small holes trap heat in while letting air in and out so the chicks can breath. It is cat proof, my 15 pound cat (yes, I know she is overweight) has jumped on the lid with no problems. My other cat, who tries to hunt the chicks, can't find anywhere to reach in and grab them. The heat plate makes it heavy enough that the cats can't knock it over.
The tub can hold a lot of chicks, I just recently had 20 baby chicks in there (only for a week). Based on how many chicks you have and what size they are, you can keep them in there for up to month. You probably wont need anything to stabilize the water if you use shavings. The shavings do a good job of keeping the waterer in place.