i would go buy a 55 gal barrel and cut the bottom off at what ever depth you would like .
or you can use cement mixing tubs that people use for rat racks
or best yet buy a small plastic or metal "trough" from your local farm and feed store they come mostly in 10 gal circles or 20 gal ovals (well just the sizes id use ) but you can always go bigger ! but id keep just a fountain pump because you should almost change the water every day anyway ! or you can use a pleco and a canister filter!