why not, just make sure that rubbermaid plastic is free of anything harmful to fish. usually its safe to hold water in it.
Id get some fish that can survive winter temp, and throw that thing in the backyard
(watch out for cats/racoons/etc). Then id look for a DIY pond filter guide, you know with the nylon pot scrubbies set up, with a trickle effect on top, haha now i need one.