Hey guys, by the way, thought I'd chime in on this topic. A couple days ago I had some micronized that had been sitting in water in the fridge for like 5 weeks or so (I had forgotten about it). Aside from some gas and a really funky taste, I was fine, no ill effects. I'm guessing the gas was from the extracted starches after it had been sitting for so long...
So, if you have that old kava in the fridge, as long as it's been sealed, light some incense and go for it.