No, there isn’t such a thing. In Italy you order your coffee and stand at the bar and guzzle it down; sit at a table, pay more. There are NO disposable coffee cups in Italy. NO coffee to go. NO coffee cup litter. It’s a cultural thing; and part of the economy.
I finally bought a bus/metro pass for the week and immediately hopped on Bus 85, which took me more or less on the route of my walks of the past two days (my goodness, did I walk!!) I got off at S. Giovanni in Laterano and immediately got on Bus 81, which took a somewhat similar route back to my neighborhood.
One of the easy things about a bus pass is that you validate it on your first ride, and then just keep it handy in case a bus monitor gets on to check. If you don’t know the procedure, you might think that everyone is bucking the system, but most people have some kind of pass. The pass is valid for the Metro, as well, but you have to put it through the machine each time. By the way, if you look at a map you’ll notice that the Metro circles Rome, but doesn’t go into the Centro, lest it bump into some Roman ruin.