Okay, there are threads of people about dehydration here and people who have attempted it. I suggest reading their accounts. The most famous case is of this marathon runner.
In 1994, Mauro Prosperi was running an ultramarathon through the Sahara when he was blown off course by a sandstorm. Alone and dangerously dehydrated, he found nourishment in unexpected places
www.google.com
10 Days ~ in the desert, drinking his own urine and bats blood. So desperate he tries to cut himself and bleed out (but he can't). And you can argue that he didn't want to die, but with dehydration and the delierium stage, your subconscious will take over and find you water against your freethinking will. Bear Grylls covered his story in a documentary called '
Eacape From Hell'. He survived and he had a long road to recovery form all the damage sustained to all his organs, not to the mention the rest.
Now if you're really that far from water or people, it could work sure. But you will suffer many stages of agony before you pass on. I take it you've read them in detail?
As for hanging, jumping and Drowning. Every method can fail. No method is full proof and without risk of permanent injury (that's the very nature of CTB). If you survive severe dehydration you could well end up worse off than surviving a hanging attempt. An
d full suspension hanging has a higher success rate than than drowning. So I'm not sure where you're getti your facts, but I suggest researching these topics more.
I understand your psychology, in that dehydration is a passive method and involves no active violence, but the reality is dehydration would take Godlike willpower and even with so, it's our of your hands after a while. It will be so unpredictable and uncomfortable. Any of the other methods you mentioned would be far more merciful. They'd be quick and decisive and far.more merciful.
The reality is very different from reading it on a computer and attempting. I'm not trying to patronise you and I'm not pro life, I'm pro choice. I'm just trying to warn you that this method is one of the worst, alongside starvation and drinking bleach. There's a reason why it isn't popular and almost unheard of outside of a hospital setting. I'd urge you to consi other methods that make much more sense.