There are a lot of good herbs for SHTF. Most folks take Metformin or Glucophage. Some take the newer “designer” type 2 drugs.
Berberine. has been shown to be great for type 2 diabetics and SOME type 1’s it is very effective. Some have even removed metformin and use berberine. Exclusively. Word of advice. Before changing any life saving medication or even any medication please consult your doctor and consult a knowledgeable herbalist. Randomly trying out herbs to replace drugs with no knowledge is dangerous. Also don’t wait until SHTF to try a new medicine. Do it NOW. But do it with a safety net. Have someone on hand with what ever you need for rescue. D50 D25 Orange Juice. If trying an herbal BP med have your normal one on hand.
There are some good herbs for hypertension including some very effective calcium channel blockers. Pain management has some good options also