This really only works for someone with a lot of stuff...
Go to a pet shop and buy like 50 goldfish. Then any sort of cup like surface put a goldfish. You can buy dixi cups and put them in a cup and in their shoes and such... pen holders... there is just so much variety. The other option is to get a kiddie pool and put it on his bed and fill it with fish.
Basically it becomes, how do you remove all the water with out soaking anything, and then what do you do with all the fish.
Not the most humane thing... but just get the feeder fish and put a little note like, please dont kill me at the bottom of the pool.
Another one is to wrap everything of his in tin foil. But it can be a little expensive unless you can get one of the 10 packs at costco or something.