Hello, bikeskirun and sarahAbroad!
now, listen. I think you/I/one has two options with this whole 'not drinking' thing. Either you get DH to supply you with mineral water with ice and a slice (and I am saying that ironically obv) which you pass off as a G&T,
OR, more proactively
you go for the sort of deep sigh moral high ground approach that I frequently encounter from Mummys. 'No, I'm NOT drinking. Are YOU drinking? Do you know what it does to your liver? My doctor's put me on a three week detox. Please don't tempt me, he's blood testing me next month, and I've gone private and it's costing a FORTUNE.'
OR say, 'I'm doing a no-booze detox for Cosmo, they're weighing me and everything, and there's going to be a photoshoot.' This will make you sound glamorous and interesting and since mags have a 3 month lead time, everyone will have forgotten all about by the time it's supposed to come out, or you can claim they binned you because you looked so great and it wasn't dramatic enough. I've blamed all manner of odd behaviour on 'doing it for a feature.'
OR, you could flash a discreet glance at DH and say, 'Don't say anything, but Barry's told me not to drink tonight because he's got a surprise planned for later....' No one will ask why. They will be too busy wondering whether it's a hot air balloon or some kind of athletic swing in your room.
OR, you could just wallop the ball out of the park and say, 'can't drink, medical reasons, can't say why.'
To be honest, I don't think the occasional evening out makes much difference at this stage, does it? Surely it's only if you're caning it, night after night? (In which case, Kate Moss/Kerry Katona/Britney, etc, etc, as usual)