"I also believe that we become thirstier in a fast the more toxic we are as greater amounts of liberated toxins require greater amounts of water to dilute them to safer levels "
This explains why I was so thirsty on my recent 9 day 8 hour fast. When I fast I usually go through periods where I am very thirsty with periods of not wanting to drink at all on the same fast. On this fast I was thirsty for the whole time although the thirst did subside some.
I think you have hit on something here. This is so deep.