Continue this process over time varying only one food at a time. Remember that not everyone can eat everything on any IC diet. I suggest using the test method for new foods outlined above if you are trying any food that is new to you. This is rich and creamy and is a close copy. It should be noted that many IC patients can have problems with chemicals, preservatives, and food dyes.
Artificial sweeteners can be especially harmful.
If you must be sugar free, you could try substituting Stevia for sugar. This is an herb which is many times sweeter than sugar. It contains no calories and is heat stable, making it perfect for baking. Approximately 1 tsp. of green Stevia powder is equal to the sweetness of 1 cup of sugar. Read the ingredients on any prepared foods.