Here is the summary of Dr. Berg’s YouTube video on Acceptable Liquids with Intermittent Fasting. He covers the basic drinks that most people think, for whatever reason, they can drink while fasting.
Can you drink tea when fasting? The short answer is yes. In small amounts, the caffeine in tea won’t have a detrimental effect.
One in the morning would be great. Too much coffee, and to be specific the caffeine, can increase cortisol, which can in turn activate insulin, which we are are trying to avoid when fasting. Small amounts of milk or cream is okay. If you don’t want to trigger insulin, don’t have bulletproof (butter) coffee.
You can drink as much water as you would normally consume. If you feel fatigue during ketosis or during even shorter fasts, try adding electrolytes. Carbonated water is also fine, but avoid vitamin waters as they contain sugar.
Bone broth during fasting is great because it contains very little calories and a lot of electrolytes.
It is a hard no on the diet soda because most artificial sweeteners result in insulin release.
Apple Cider Vinegar
ACV is good, helps regulate blood sugar, helps with fatty liver disease, along with improving insulin sensitivty.
Alcohol and Coconut Water
Definitely no, due to the sugars.
You can drink unsweetened almond milk.