My son is in a rehab presently and the first few days after he began he was already telling me how he would never be able to use a mind altering substance ever again and remain sober. For where I can drink one or two drinks and then have no desire to drink more, he wont want to stop and at 8 or 10 follow the drinks up with some cocaine. Your qualifier is deluding himself in thinking speed is not going to wind him back up in the same place.
As far as the babysitting issue goes, Celebrate Recovery offers babysitting--or at least the one I attended last week did.