For the OP I have a question for ya, when I try to do this I tend to pretty much just dehydrate myself as I just really don't like water. It upsets my stomach and coke seems to fix it. Does this happen to you? Have you completely quit? And if so does the stomach get any better?? I find myself having to have a large coke full of ice in the mornings just to get some fluids in me. Otherwise I drink so little I don't even pee. Lol I feel like I'll just dehydrate without the stuff.
I believe you can do this if I did, I bet we have the same challenge to deal with. I did not like water either, at first. Now, I like water more and more for sure. I believe you will develop a liking for it. It takes a little time. Get a small bottle of drinking water and keep it with you. Take just occasional sips through the day at first.
If you think quitting Cokes will be too tough to adjust to, try this: First day, eliminate your last Coke of the day, replace with water. Second day, eliminate the next latest Coke of the day replace with water. Third day, take out the next latest Coke of the day, Then, no Cokes after lunch, then, only one Coke in the morning, then, replace that one with OJ or some other juice you like. The tapering off approach might be the one for you, just commit hard to not backsliding. You can do it!
For me, I decided to quit all at once. The first week was terrible, I admit. I had a headache for a whole week and was very lethargic. It passed and now I feel great. Either way, choose to do it. Don't let the sugar filled Cokes beat you! Good luck!