Question about electrolyte powder while on a prolonged fast

I’ve done a number of multi day water fasts over the past couple years, ranging from 2 days to 7. Usually, I will put sea salt in my water, but is that enough? Has anyone ever done LMNT or similar electrolyte mixes while fasting?

When I do these long fasts it’s basically a deep cleanse and reset for my body and soul. Not sure if putting a powder into my body will affect that at all or if there’s any danger.