First off why did you pour fruit and barley in the tank to begin with, are you stupid? The fish and whales in the ocean don't drink soup because they're tired of drinking the water that they live in.
Maybe you should give your dog water too and give up on the fish hobby if you think your fish need to eat whatever it is you pour in there.
Take the fish out of the tank and back to the store now if they're not dead already, and really read up on the fishkeeping hobby before even attempting to have fish again.