what is the best food safe dmt extraction tek?

There is no "best" tek, there are different teks with different characteristics. Check the FAQ, check the teks in the wiki, and chec the eco friendly extraction teks subforum: https://www.dmt-nexus.me...t.aspx?g=topics&f=61

Usually people go for the amorfati / q21q21 teks using calcium hydroxide as a base and limonene as a solvent, but there are other less explored options around

then see what you think looks best for your case, and after researching, feel free to ask specific questions.