Discussion: Realism in Books – Basic Necessities

Food. Water. Shelter. Bathrooms. There are a few basic things that we humans need in order to survive, and a few other things that might not be entirely necessary but that we'd definitely notice if they weren't available. Generally in contemporary books, these things are common and available and not an issue. But what about books set in the past? Dystopian books? Post-apocalyptic books? Books in...