I have one, Marcella! Mine is granite mortar with a ceramic pestle. I’ve used mine to grind fresh spices and herbs. That’s basically what you will be doing with your Mr. Stevia. It also is handy if you want to powder a medication from pill form so it can be tucked into some jam or ice cream if a person has difficulty swallowing.
I dare say, as one becomes adept at learning herbal remedies, the grinding of herbal substances with mortar and pestle and combining them with others could become quite useful.
I wrote an article on Survival Podcast website about herbs/spices that are medicinal and what they are used for and put the links where to go to read about each one, how much to use, etc.. I haven't finished copying the info. at the links for my own personal use. I did buy all the spices/herbs in bottles. If you want to read that article, let me know and I'll give you the link where it is.
The problem is, I don't have ANY growing, don't know where to get the plants or seeds or whatever, so I'm at a loss. If you grow this stuff, maybe you could help me by telling me what you grow, where you got it, and what it takes for them to grow. I would grow them in small grow bags as I don't do ground dirt.
For the mortar/pestle, I'm always thinking about having no power and that piece of equipment would be extra good to have as well as have now.