I am not a cook. However, my experience as a carpet cleaner (I have to deal with chemistry--particularly pH--on a daily basis) leads me to believe that baking soda might solve your problem.
Baking soda, when added to water, is a strong alkaline. It also tastes a bit salty, just so you know.
Of course, it might make your gumbo rise out of the pot...
General Tsao