Have you read the protocol & food list? Please study them thoroughly. Also please take some time to read through the posts & Able/ Raster responses on this forum and you’ll save yourself a lot of time asking questions that have already been answered elsewhere and save yourself a lot of time & frustration! You’ll find that’s a lot more effective way of finding out about this diet and the antifungals etc. You’ll also find recipes for various breads and full directions about how to make Kefir.
As Raster said, any decent healthfood store will have Buckwheat flour (and my local Tesco does but not all).
Maybe once you’ve had a chance to do some reading on this forum you could post your ideas on your planned diet and which antifungals you will take.
Just some thoughts!