This works well for couples. My fiance and I always end up ordering a water and a sweet tea when we go out to eat. We split the tea (which always has refills) and then have the water to share as well.
Why pay for 2 drinks when you can get refills on 1? It saves about $1.50-$2.50 depending where you’re eating.
At most fast food places, if they don’t have good sweet tea we just get water. Sometimes the workers give us a drink cup anyway, because they see we’re not getting anything to drink.
By splitting, I also feel less bad about drinking a whole glass of sugary sweet tea. I don’t feel the need to drink an entire glass myself, since we’re splitting it.