Alright, I figure it shouldn't be that hard, but...I can honestly not get 1 mystery goo. I need around 6

I've read that the three mushrooms drop these items. I can never encounter any of them.

If anyone could give me any tips dealing with the best location/strategy to find this much needed item, I would be eternally grateful.

thanks,
-Adam

P.s. I'm talking about kh1.