Agreed, at least around water, my kidneys are hyperactive and need constant lubrication. Food, though... meh...
And I wouldn't do it for the suffering, I would genuinely do it for relaxation, like a full habitat sensory deprivation chamber.
What I do for suffering is try to face the sun for longer than I feel comfortable, the whole idea of self-immolation being purifying and such. I can see why some would think that, baking in the sun really does a wonderful job at bringing me back to the present through widespread pain.