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This works, but then if you have a job with free soda...discipline is still needed.
I like water more than soda. If you'd like some flavour then try squeezing a few drop of lemon juice
BTW, almost all water served at restaurants in China is lemon flavored. The best halfway point I've seen is flavored soda water. Fizzy, slightly flavored, gives you some of the feeling of pop without the sugar. Still, put coke in the same fridge, and it requires some willpower to take the flavored soda water.