Is there any truth to this?
Does Drinking Water On An Empty Stomach In The Morning Have Any Extra Benefits?

The short answer is no. While it may be true that drinking a glass of water on an empty stomach may help you feel more awake or refreshed first thing, it’s not doing anything additional because it’s on an empty stomach. Truthfully, there is no evidence that drinking water first thing in the morning makes any notable difference in any health marker. The most important thing is simply that you are properly hydrated throughout the day. When you get the water is probably more of an individual preference.
Should You Drink Water On An Empty Stomach When You Wake Up In The Morning?
Water is essential

Your body can’t produce enough water through metabolism to meet your daily needs. This means you need