[tristram_shandy]

I can actually speak from expertise on this! I've done fasting for the last five years (daily, eating once between 6-9PM), but this advice mostly comes from endurance road biking.

You can find "Salt-Free Salt" products in most supermarkets, typically in the spice section, it's a niche product for people on very low sodium diets. I believe the biggest brand name is "No Salt" -- these products typically contain potassium chloride, calcium, and some magnesium salts. Because of this, they're an excellent hack for athletes, anyone operating in extremely hot weather, and anyone looking to start a fast.

To make a (more or less) isotonic solution for hydration, add one teaspoon of the potassium salt and one teaspoon of normal salt per 1L of water -- this will give you a solution with a balance of sodium, potassium, and small amounts of magnesium and calcium that's around 0.9-1.0% salinity.

Personally, I adjust my diet to include slightly more of the potassium salt.

[Powerofmene]

Thanks for this info. I forgot about the No Salt and Salt trick in water from my running days, but it really does work. Thanks for this reminder because hydration is really the key to success in fasting.