So is rapid dehydration the goal for maximizing fat loss in dry fast ?

It sounds like that is the goal - get to a dehydrated state, and then hope the body starts autophagy for water. If it IS the case that rapid water-loss is wanted (dehydration), then having very high water intake in the days before, not re-taking salt (retains water) and making yourself lightly sweat staying hot would be the 'classic' way to lose water rapidly... If you don't care about fat loss, and only want to get through the fast as long and comfortably as possible, then having salt and NOT sweating would be more sustainable. Obviously, being dehydrated comes with risk.

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Not everyone is doing dry fasting just for weight loss. There are many other benefits and healing that take place during a dry fast. It helped me get rid of acne, loose skin, joint pains etc. Weight loss is an added benefit, prolonged dehydration does come with risks but through experience with dry fasting you’ll be surprised what the body is capable of.

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I lost a ton of weight a while ago and daily dry fast for health, for weight loss honestly just water fast, go as long as you can then once your happy at the weight you want be just dry fast or interment fast every day and you’ll maintain your weight easily

https://www.reddit.com/r/fasting/comments/bzi79g/23_day_fast_done_5_months_total_fasted_am_i/

This was all water fasting and I lost weight mega fast, salt and potassium every day + hours of walking every day and you will be at your goal before you know it.

Sounds like you want to dry fast for weight loss because your impatient, why take the extra risk over extended water fasting? You will still lose weight faster than 99.99999% of the population and its safer

Any questions feel free too ask