Caffeine. No sugar. Flavor. Warm.
I didn't ever "quit" soda but I went from 6-12 a day to maybe one a week at fast food. I don't buy it for my house except on rare occasion.
Best bonus? Dental health: stopped tearing up my enamel and although the doc still complains my teeth are stained... he says the gum health is a huge improvement.
Unfortunately my weight went up- 125 to 165 over 8 years of gradual reduction but I attribute that to a shitty stress fueled work environment, kids and a desk instead of warehouse.
Coffee my friends. Black.