My friends would notice too if i wasnt drinking at a special occassion, even though i usually only have 1 or 2. I was pg at my dh's 30th so i stashed a bottle of non alcoholic wine (from the supermarket) in the back of the fridge and just sipped that during the night. I guess you could rinse out an old screw top chardy bottle and fill it with something else. I guess you might still have the problem of sharing

Good luck and have a super time whatever you decide