How can alcohol and caffiene hurt the body for rehydration?

Alcohol Poisoning: Alcohol poisoning symptoms include: confusion, stupor, vomiting, seizures, slow breathing (less than eight breaths a minute), irregular breathing (a gap of more than 10 seconds between breaths), blue-tinged skin or pale skin, low body temperature (hypothermia), unconsciousness ("passing out"), and can't be roused. A person who is unconscious or can't be roused is at risk of dying.