Watery eyes are not only because of any infection or allergy but it may be because of some vitamin deficiency. Problems occur due to some deficiency of the vitamins like A, B12 etc. You have to take this vitamin to get rid of this type of problems. You have to add the food in your diet which contains all these vitamins. You have to take a food like carrot, coriander, spinach, all green vegetables which are beneficial for eyes. You can also add omega 3 fatty acid foods like salmon in your diet to increase production of lubricants in your eyes.