*NOTES - Oysters come in quart, half-gallon and gallon containers and are stored in their own liquid (oyster water), and many seafood markets sell oyster water for a couple of dollars. Bring your own containers and they might just give it to you. If you can't get oyster water then use shrimp stock, chicken broth, or water in its place.
If you're not using oysters at all then use 7-10 pounds of shrimp.
Filé is a thickening agent so you want your gumbo to have a thin consistency. The filé will thicken the gumbo right in your bowl. A little filé goes a long way.