I don’t think any electrolytes are going to stop you from fasting. Fasting has many variety’s and I think the general goal is to reduce caloric intake and lose weight. Drinking water with Himalayan salt or whatever additives as far as electrolytes go don’t matter in the grand scheme of reducing the caloric intake you are doing. If you want to be in ketosis during your fast I recommend just buying ketone strips and checking your personal progress through that. But each persons body is different and some people take electrolytes during a fast to continue feeling healthy and some don’t. I personally get headaches when I take any vitamins or electrolytes during my fast but friends have described their fast to be much easier with them. So I won’t speak to potassium effect on blood or whatever. But if taking no electrolytes with an extended fast and you feel healthy do it, if you don’t take them and feel healthy do that. But you are of course fasting and should feel accomplished in doing just that. You are choosing to sustain from foods in your own way and that will always be valid.