Re: the good news (water and salt too!) EDIT
Native Americans used plenty of herbs...
Essiac for one has two herbs that contain iodine, turkey rhubarb and sheep sorrel. In addition, water cress was eaten as well and contains iodine. If the water was short, I am sure they found a way and there are probably sources we have no idea of. Once Europeans showed up though, a good part of that knowledge was lost.
My understanding is that the Native Americans used domestic rhubarb NOT turkey rhubarb... however domestic rhubarb is apparently a source of
Iodine as well. I found this...
http://www.bodydynamics.com/mcbreakdown.htm
Rhubarb Root
Rhubarb is a mild stimulating tonic to the liver, gall ducts, and mucous membranes in the intestines. It acts as a laxative, clearing the cause of intestinal irritants and checking diarrhea with astringent action. Rhubarb acts as a gentle cathartic. It has been used in almost all thyroid diseases when fecal matter is accumulated in the intestines or to prevent such an accumulation.
Rhubarb contains vitamins A, C and B-complex. It is high in calcium. It also contains sodium, potassium, some iron, sulphur, phosphorus, cobalt, nickel, and tin.
And this
http://www.oxymega.com/thyroid_gland.html
Foods rich in
Iodine are asparagus, bananas, carrots, chard, cod-liver oil, egg yolks, garlic, lettuce, lima beans, kelp, mushrooms, onions, potatoes, peas, radishes, rhubarb, seafood, spinach, strawberries, squash, and tomatoes.
and there is more...