I just assume this to be clear,I would use enough to taste it but not like ocean water where you want to vomit meaning to much. ALso a small amount of potasium. You can get nusalt or losalt brands that have potasium and a small amount of sodium. Now for magnesium to allow your muscles to not cramp and just relax you need magnesium salts. Those can be digested though you will get runs at low amount. Now if you use in Walmart it's in beauty section Magnesium Oil. This is a magnesium and pure water mixed into a liquid "no oil" and you spray onto skin and it's absorbed. My bottle says 8 sprays=100mg. Also leave a salt residue on skin when liquid absorbed but does not make you shit yourself like taking to much magnesium suppliments orally. I've used this to stop muscle cramps by spraying on locally after a hard day and will stop a calf cramp in 20 seconds or so. You need the salts since all the water will flush salts from your body over time and the regular salt sodium chloride is the most important though you don't need to use it for every glass. Also if your breath smells from toxins exiting by breath this will kill any bad bacteria and neutralize smells that are from resudues in the mouth so keeps infections at bay. you don't need to use magnesium oil or potassium every day but the sodium to low your heart stops beating and your blood is loaded with salt. I'd also take an iron pill to keep you red blood cells working at top capacity and this is just something I believe but didn't read about. Anything sweet tasting your body will start to produce insulin is what I did read and anything over 50 calories also do that. I read that using apple cider vinegar in tiny amounts will not kill the fast effects but this is not verified or tested on autophagy. So salts and water and some skip water for days also but didn't get into that. If I was you I would read comments on natural sites that talk about how they fasted and their mistakes and their successes. I would also use youtube to find people like doctors that have patients that avoided heart attacks and then found their circulatory systems were cleaned after extended fasting as in 6 months. I remember this one guy on reddit "you can't say if true or bullshit and he used speed" he said he fasted for "If I remember right" 2 years on a water fast and lost like 500lbs and exercised some and his skin since fasting shrunk so unlike surgery didn't need the skin be cut away with scars everywhere since it hung like meat curtains with stretch marks. https://www.healthline.com/nutrition/water-fasting https://blog.supplysideliberal.com/post/2018/4/3/how-fasting-can-kill-or-slow-down-cancer-cells-while-leaving-normal-cells-unharmed https://www.youtube.com/watch?v=ZhGzU0Chv1g Some links above, don't buy anything but just a sample of some sites found using a search engine but these are just fast ones not the most informative just a couple that I found relavent. use search terms like "Can extended water fasting cure *place disease or condition here*", pros and cons of water fasting, how to water fast safely. These searches can give great results but make sure your search hits aren't like retail natural oil foods doctors sites for appointments. THis is a simple and almost free way to cure so if they're selling you stuff or services as in the page is an ad then go to another site since they are preditors and cash is king. If the site asks nothing then it's likely most honest in my view.