Personally, I just get whatever is the cheapest, which is usually an off brand.

Here is an example of good salt.

Here is an example of what you don't want (lite salt).

Edit: Potassium iodine is fine as it is only used in super small quantities for the iodine content. What you don't want is a large amount of the salt being potassium based, e.g. potassium chloride.

I swear by this, covers both sodium and potassium

Morton Lite Salt, With Half The Sodium Of Table Salt, 11 oz https://www.amazon.com/dp/B0005YM0UY/ref=cm_sw_r_cp_apa_qUQLBb4ZK2K81

For potassium I use this.

For magnesium I use this.

I do not take a multivitamin.

I also get a lot of potassium from avocados.