Why do i literally always have bad breath? even when im well-hydrated and full, i always have bad breath?

Bad breath can be caused by many different factors, including sinus infections, periodontal problems, smoking, cavities, acid reflux, and your diet. Address all of these possibilities with your dentist and physician, and I'm confident that your problem will at least be minimized, and hopefully eradicated.

When was your last Dental check-up? Most common cause of bad breath is sulfur producing bacteria between teeth or on back of tongue. See your Dentist. Start flossing. Once all dental causes eliminated, if halitosis persists, next step is a complete medical physical. And yes, stay hydrated.