Question on setting up own grounding system

I'm trying to set up my own earthing system in my house. I live in an apartment and surrounding me is just a bunch of rocks instead of soil.

I have a grounding stake but does it with a bunch of rocks? Do rocks conduct enough electricity?

Also, I was wondering if anybody knows any cheap earthing beds. I see 2. One is 300+$ and the one on amazon is 170. Anyone know if the 300+ dollars one is worth it? It's the one from intuition phyisician website. Or should I just get the 170 dollar one from amazon?
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