I am all for the detox idea.

I was going to say that you could say you are on a weight loss program but thet may not work as you are going to get bigger.

You could always say that you lost a bet with DH and you are now the designated driver!

In regards to living with the parents and being sick. You could say that your doctor has said that you have a virus and are not allowed to drink whilst being on the antibiotics. Then you could just say you have gone off it.

I often order a mocktail when I go out with my gf's now (they know im pregnant) but I was sick of ordering soft drink or juice. On saturday i had 2 pina colada mocktails and people wouldnt have even known!

Make sure you keep us updated on how you go.