Cookie, you could buy the first round so no one sees what you are having and then order whatever you like. At home I drink schloer, ami or merlot grape juice from Waitrose. In a pub maybe virgin cocktails, lemonade or tonic water without the gin or vodka. There are usually a really poor selection of soft drinks to choose from but I had a pretty iced tea that looked like a cocktail recently. Elderflower cordial could also pass for a white wine spritzer?
You could also say you gave it up for lent, or that you are driving, or are on antibiotics. Dry January was a good excuse for me and DH as we both gave up when ttc as everybody did notice we were only drinking soft drinks.
It was nice to wake up this morning and be the only one in my house without a hangover but I did feel queasy anyway making blueberry pancakes with gloopy buttermilk!