Hi, does anyone have a recipe for an effective organic weedkiller?

[lark]

We moved into another house in the neighborhood that has lots of paths and plant features. The previous owner gave us a recipe he used that was good, but we have lost it and hubs couldn't recreate it from memory. The version he did didn't work!

I'm having huge back and leg problems and used to be able to handle quite a bit of weeding, but when I tried it recently, I had huge problems develop in my lower back. Doc says no more bending over weeding.

Hoping someone has a good answer. Weeds in NE FL are so invasive and pervasive.

Thanks!!