Bone broth can vary widely depending on brand or what you add if it’s homemade, but you can find many that are less than 50 calories per cup, so well within the ability to use and still be fasting.
ACV has no calories so it’s also fine for fasts. I will take peoples word for it’s benefits as I can’t stand to take it in water. I don’t mind it in recipies, but not in water and certainly not straight up.