Sparkling water is something you can enjoy from about list 3 up-once you have determined you are ok with it. However, in  IC and in general, sparkling water should be your "treat" water, not your main source of water intake.

Nothing hydrates your body like water and sparkling water can be dehydrating.

So this is a good rule to live by IC or no IC. REgular water should be about 85% of your daily water intake and sparkling can be about 15% and no, the water you use to make your coffee doesn't count!:)

Dr.M