Cod liver oil is the primary method I've heard of. Also boron scavenges fluoride and is required for optimum testosterone levels. Boron is also deficient in modern food because industrialized farming is not required to replace it. Can't imagine why that would be. I use a pinch of borax in a smoothie but it's technically industrial grade, but the company that makes it claims nothing extra is added to it, so use at your own risk. Iodine also scavenges fluoride iirc.
(pb)
Can't be done, anything below a certain level will cause the industry to implode. It was around $1.80 last I heard.
If anyone is looking for a good quality liquid k2 or d Thorne has some good stuff.
https://www.thorne.com/products/dp/vitamin-k2-liquid
https://www.thorne.com/products/dp/vitamin-d-liquid