It looks like that sentence is cut off—so I’ll answer what people usually mean by it.
Drinking water on an empty stomach (like right after waking up) is often promoted as a health habit. Some of the commonly claimed effects are partly true, but some are exaggerated.
Here’s what actually makes sense:
Drinking water first thing in the morning helps rehydrate you after several hours without fluids during sleep. This can improve alertness, digestion, and mild constipation in some people. It may also gently “wake up” your metabolism, but the effect is small—not a weight-loss shortcut.
It can also help your stomach and intestines start moving, which is why some people notice better bowel regularity.
However, claims like “detoxing your body,” “burning fat,” or “cleansing toxins instantly” are mostly marketing language. Your liver and kidneys already handle detoxification continuously.
If you want, tell me what you were trying to complete after “can…”, and I can break down that specific claim.