wltnsmtn

You could try the syrups for the Soda Stream machines. They have diet flavors and no carbonation since you would just mix it with water. I have thought about getting some, as I like the cola flavor and it seems better than letting a soda sit and go flat for the same affect.

You can get them at Food Service stores. Here in Washington State we have Cash & Carry, restaurant supply type store, no membership required.