Thoughts on solid mineral supplements, NOT the powders, such as potassium supplements tablets, not capsules made with magnesium stearate?

In the first two days of a dry fast, I will break the dry fast with 5 or 10 potassium tablets throughout the day with maybe 12oz water total, making the bet that the strength I get from potassium will allow me to fast longer, more than outweighing the small stop in autophagy. My only question is how much harsher is this on the body than pure potassium salts such as LMNT salts? Do you think 5-10 potassium tablets would be kind of harsh on the body compared to pure potassium salt, when your body is in a healing state?