If you're not allergic to something that could be causing your eyes to water due to allergies then it could be just inflammation or other irritation of the eyes.
Having dry eyes can also cause your eyes to start to water or even blocked tear ducts.
I would get some eye drops and apply the eye drops to your eyes or apply a warm wet towel over the eyes which can help with the irritation and inflammation of the eyes.
If that doesn't work you may need to see your eye doctor to get some prescription antibiotics for your eyes.