If I’m with friends we usually just split it, unless one person hasn’t been drinking and the difference is quite a lot then they’d just pay for their own.
I took my team out for lunch at work once, I paid for the all of the food on a company card but alcoholic drinks weren’t covered. All 12 of us had a couple of drinks, but my team still insisted on sitting there with a calculator to work out who owed what down to the penny. They had just had everything else paid for them, I was mortified having to sit there while they squabbled over it in front of the waiter who was stood there with the card machine!
I took my team out for lunch at work once, I paid for the all of the food on a company card but alcoholic drinks weren’t covered. All 12 of us had a couple of drinks, but my team still insisted on sitting there with a calculator to work out who owed what down to the penny. They had just had everything else paid for them, I was mortified having to sit there while they squabbled over it in front of the waiter who was stood there with the card machine!