This is the iodine I mentioned. Its nasty as hell of you try to drop it right on your tongue. It tastes like you licked the inside of a hospital toilet bowl, but it has the pure iodine you need and in high dose. I think this is essentially what you used to get from the pharmacy shelves back in the 70s and 80s. My wife prefers the X3, i think thats mixed with sugar and glycerin to make it more pallatable. I keep this X2 around and take some if my neck feels swolen. I'm not endorsing this brand, but leaving it here in case you're curious.
https://www.infowarsstore.com/survival-shield-x-2-nascent-iodine