Chris: I just corrected what I posted earlier. The kiddie pool should NOT have any algae retardants! Sorry.
A 3' diameter 2' deep bowl would probably do until you can set up something bigger. If you are just interested in raising a handful, you might get by with it. Where are you located? (I'm wondering what your weather is like in July.) If you are in U.S., I'd check out K-mart or Target for a kiddie pool. There are ones with a top ring that is inflated, which hold a good amount of water and are easy to install. Be sure NO algacide.
KFG's idea of recirculating pond water through a grow tank is interesting, but I'm not sure how you would implement it. Maybe she will explain later. In the fry stage you would not want too much current. I'm thinking a sponge filter used in aquarium spawning tanks would be adequate ... at least at first. I f you are going to try raising a few hundred hatchlings, you'll end up needing more after a few weeks, but I'm jumping way ahead of where we are right now.