I was told to offer my goats free choice baking soda and salt. What kind of baking soda and what kind of salt? Is kelp powder a good supplement? What about a mineral block? If yes, what type? I know that sheep nd goats have different mineral requirements, especially of copper. Anything else I might be over looking that is essential to the health of my goats? Should I get those plastic divided tubs that screw into the wall? TIA! Blessings, Jillis!