I cannot prove that I underwent two extended fasts on distilled water FastingGuru, but that is what I did.
The first fast of 25 days was quite horrendous with severe detox for most of its length, until towards its end where they largely subsided. The second of 30 days followed by over a month of careful refeeding was a mostly enjoyable experience with some detox at the beginning; both on distilled water.
I respect your views on the use of distilled water, as I do with anyone else, and there has been much debate over its use, but I came down heavily in favor of its use and for a variety of reasons.
Water has the chemical structure and formula of H2O (One part Hydrogen and two parts Oxygen) and that is it; anything added to this is just a contaminant.
The water cycle replicates this process: evaporation, condensation followed by precipitation. This is however imperfect now because of atmospheric pollution.
The best example of distilled water's safety and benefits is Norman W. Walker, D.Sc., probably the earliest advocate of distilled water. He believed that because it lacks minerals, distilled water acts as a cleanser in the body, leeching out inorganic mineral deposits and thus relieving Arthritis and rheumatism suffering, along with other ills, rather than being the cause of Hypermineralization or the excessive deposit of minerals in the body.
An aversion to water on a fast can occur whether this water is distilled or spring, or any other type of water. This is not a symptom of an "electrolyte imbalance" as you have stated, because the body conserves and uses its nutritional reserves in the most economic manner possible; this is known as Homeostasis, and an inbuilt biological mechanism of the body. This is the reason we maintain a neutral PH of neither being too acidic or alkaline, and why even on the most prolonged water-fast before starvation sets in, scurvy does not develop, but will do so on an ascorbate restricted diet.
You also mention the avoidance of salt in the diet leading to an aversion of water on the fast, but lets be clear here: the body does not need salt (sodium chloride), it needs sodium, or the organic form. This is the reason why a pre-fast diet of some length should be a highly nutritious one, and preferably a plant-based diet which contains most all the minerals in the organic form and of use to the body.
This is why we should avoid exercise during a fast because this will deplete nutrients more rapidly with calorific expenditure.
No one advocates "dehydration" on a water-fast FastingGuru as long as you drink when thirsty or at least one to two liters per day, and judging by the demands of thirst and how frequently you need to make a trip to the bathroom.!!!
Orthostatic Hypotension is a normal part of any fast because of the lowered state of blood-pressure that fasting brings about: normal and nothing to do with dehydration, although that wouldn't help matters. As long as the faster arises from a prone or sitting position quite slowly then any adverse outcomes such as fainting and possible injury will be avoided.
btw were these electrolyte imbalances measured FastingGuru? or is this just speculation and conjecture on your own part?
The body requires no supplementing on a fast FastingGuru as long as the pre-fast diet has provided optimum reserves nutritional reserves are conserved and the body should then be left alone to carry on its own innate work of healing and cleansing.