We had friends come over last night who knew we were thinking of trying soon and would def be suspicious if I didn't drink. I pulled a perfect coup and wanted to pass it along: before they got there or when they were sitting in the other room, I poured a bottle of beer into a pint glass for my husband and then I kept the bottle and rinsed it out and filled it with water. I used a Notre Dame beer coozie too to block color issues, but that was prob unnecessary. Not sure what we'll do at other people's houses but it seemed to work brilliantly! I did it twice so not to seem to have passed down their yummy Harpoon 6-pack (a little sad at that).
Re: Beer fake-out success story...
If you need to fake it at a friends. Do the same thing you did at home just take a 6 pack with you. Crack one at home, fill it with water. Put the top back on. (screw tops work best) Then make sure you grab the opened one. HTH