There was this one time at some airport in China (can't remember which one, somewhere in the south probably and flying Air China) where they wouldn't let me in the lounge because the flight was already boarding. So I was straightforward with them and made it clear that the only reason I wanted to go in was to get a can of Coke and some snacks. So they've let me in without even scanning my boarding pass and I was back out in less than one minute with a can of coke and 2 packets of crisps .

Just tell your wife to take the bottles from the lounge, no one will care.