Got a stuffy nose from allergies or a cold? Nasal irrigation may help. You pour a saltwater (saline) solution into one nostril. As it flows through your nasal cavity into the other nostril, it washes out mucus and allergens.
For nasal irrigation, you'll need a container and saline solution. You can buy prefilled containers, or use a bulb syringe or neti pot. All are available at drugstores.