I think you have two options for saving tomatillo seeds: the first is : just mash the tomatillos, wash out all of the waste and leave them to dry on non-absorbing material, I use this method every year and it just works fine. I never tried fermentin g them, but it should work, I do think it's easier without the fermenting .But indeed, they are self-sowing over here as well. Keep in mind that two varieties of tomatillo need to be isolated, they cross easily.
Tomatillos need about the same consditions as ground cherry, they don't mind lots of rain if the temperature is high enough, and there is a bit of sun. I never had any problems with them and I'm growing them for over ten years now. You do need at least two plants, because they are not self-fertilising. And even in very dry conditions they do produce lots. Sometimes, when plants have 'wet feet' they can show the symptoms compared with plants in a very dry condition, and that could be an abortion of fruit, or even leaf wilting,
Frank
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