- Simplest: just divide total by N people
- Different subtotals for food, alcohol, and drinks
- The most complex is probably: food is split evenly, but individuals claim beverages. (And there are some cases where certain food items are also claimed.)
Usually one person is the "treasurer:" they pay the entire bill and make a chat room to finalize with other members (share a table of who owes what and maybe send payment requests)
Interestingly, KakaoTalk has a built-in feature to split bills in this manner. It's not intuitive to use, so a lot of people just do it manually.