first aid is different for different people.
I can tell you that if my family first aid kit did not have bandaids, Tylenol, aspirin, motion sickness pills, and a few other basic meds - I'd be as good as DEAD. My wife would probably just kill me. Which, I suppose, would leave more food for the remaining humans :-)
Those "little things" are big deals when families are involved.
Poisoning would be a tough situation in a real survival situation. I can't imagine a practical scenario where it would happen ... except perhaps kids eating the wrong type of mushrooms or toddlers eating something way out of line. But in a real survival scenario - it tends to imply that parental surpervision is 100%. Becuase the chances of dialing the Poison Control Center would be slim to none. I would try dilution, and possibly some ground up charcoal. The chances that my kids would have eaten strong acid or alakali is pretty much zero, and anything else I would want to get out of their system as fast as possible.
cheers,
Pete