Can+I feed my 3 day old fry egg yolk and crushed flakes?

I mean for the first week [or two] until I can get baby brine shrimp to hatch. Wait, can theycjust eat the eggs of brine shrimp? Must I have an airstone to hatch them? I only have 3 platy fry. There are 2 more I wish to catch, but I may just let those get eaten. My saved fry are in a makeshift fry house[plastic bottle with holes] in a community tank.