Potassium and Magnesium From iHerb

Hello, I successfully finished 3 days fasting with salt only. Now I want to try 5 days and then 7 days. Potassium: [https://www.iherb.com/pr/now-foods-potassium-citrate-pure-powder-12-oz-340-g/69741](https://www.iherb.com/pr/now-foods-potassium-citrate-pure-powder-12-oz-340-g/69741) Serving size 1/4 tsp, 448mg, which means \~2 tsp needed Magnesium: [https://www.iherb.com/pr/doctor-s-best-high-absorption-magnesium-100-chelated-with-albion-minerals-100-mg-240-tablets/16567](https://www.iherb.com/pr/doctor-s-best-high-absorption-magnesium-100-chelated-with-albion-minerals-100-mg-240-tablets/16567) Each tablet is 100mg, which means 4 total for fasting 1. Are these good supplements to order? 2. Am I right about amounts? 3. Any better ones from iHerb?