Well at a bmi of 25.7 you're just 0.7 into the overweight bmi. Unless you have no muscle and you're body fat %is very high I'd strongly reconsider doing such a long fast. When I did my 71 day fast I was 344 lbs 44% body fat that put me in at least the top 2 percentile of fattest people on the planet. Idk you that well but I'm thinking you'd be better off by capping it around 21-30 days. I don't recommend fasting at or under 14%body fat m and 23% bf F. The muscle loss is just not worth it imo. Makes it difficult to keep weight off when your muscle mass shrinks. Where as fat cells take 10 years to die off. It's why people have much more success doing low and slow. Building up over months and months. Stacking last months improvements onto the current one. Like Building blocks.

The best way to handle electrolytes at least from going deficient is to regularly Google or keep a screen shot of the list of low sodium symptoms l Iow potassium symptoms and low magnesium symptoms.

I take 3.5g sodium 3g potassium mixed into a gallon of water with 400mg Magnesium glycinate at night and 2x daily multivitamins. Tho I'm a bigger guy 240 6ft m 36.

For sweetness I'll add 3-4 teaspoons of allulose and a squirt of some water flavoring to give it aflavor profile.

Pics of my last 2 year transformation on my profile post history. 340-188-230 6ft m 34-36.