Salt N Pepper

Push it push it real good, ROFL. I wonder how I can get the actual salt or pepper inside the bottle?

You can fake it with a solid interior mesh with a material that resembles pepper and salt. Doing it with particles to make it look full would be rather particle intensive. If you are going to have some salt or pepper spilled out onto the surface those can be done with particles or even again just a mesh placed on the surface and shaped to the desired spill size and the same material you used inside the bottles for the spilled portion.

Here is one I did for a tomato scene. The node tree section is for the pepper but the salt isn’t much different. The color ramp is the key to getting those slight color separations.

Yep, I’d go with what the Bananaman said.

Nice Ed. Again what Steve said is a good way to do it