Lori, Have McGeyver build a box out of plywood or something,and as tttt8 said, line it with a heavy plastic so it will hold water & drop in the grill. Please read the links above on how to do it & what not to use.What I read is stainless steel is very bad to use.
I have also used D-Rust-It and agree,it works very good too.

1957 Chevrolet 1/2-ton Stepside LB in the Gallery
My Photobucket shots

The person who has nothing for which he is willing to fight, nothing which is more important than his own personal safety, is a miserable creature and has no chance of being free unless made and kept so by the exertions of better men than himself." - John Stuart Mill (1806 - 1873)