There are many ways that you can say no or decline alcohol if it‘s offered or offered as part of a celebration
“No thank you.” A simple response with no explanations needed for anyone who asks why not.
“I’m trying not to drink right now.” A way of gently explaining why you might be turning down alcohol while simultaneously supporting others in their goals as well.
“I’m on medication and have been told not to drink.” Another gentle way of explaining that you aren’t drinking without going into too much unnecessary detail.
“I’m driving.” A classic excuse for why you don’t want to drink, and a valid one.
“I’m celebrating too – I just celebrated/got married by not drinking.” A good response for those social situations in which people may look at you suspiciously.