The soup at my work allows you to use either a bowl or a cup. I use the cup, because I drink it at my desk, and you shouldn't drink from a bowl when you're at your computer desk at work!
I do sometimes slurp stuff from bowls, but that's mostly when I have noodles in the soup and am done with the noodles. It's efficient consumption.
Drinking from a spoon is still drinking, by the way. If you pour water into a bowl and use a spoon to consume it, you're still drinking. Hence, you drink soup.




