I discovered that you can have infinite amoount of food or drinks here is how to proceed :
Let's say you have a coca-cola in your jacket , start drinking it, then while drinking animation is going , drag the jacket containing the coca-cola on ground and pick it up again (you need to do it before the animation finishes)! And bam there you go the coca-cola has been reset(full again) and your hydration level was recorded on your caracter.Same goes for food.