Never lose hope, maybe it will be in an expansion, or at least in the next one. Think positive... >_<
That would be interesting, although I'm not holding my breath as it's something they've traditionally left to modders to implement. That said, I'm not sure what modders can do about drinking, aside from adding 'water' potions, since there are no water-based activators.
@IREadam:
I'd actually rather it be a one-time option during the chargen process, so that you have to commit to it to use it, but I can see the merits of a toggle system as well and would simply just leave it on if it were in that form.