Please choose the correct ending to complete the given sentence: Health: [header] How to use a nasal rinse [title] Place a clean, airtight container on a flat surface. [step] To begin making your nasal rinse, make sure you have a container that will be suitable for mixing and storage. [substeps] This container should not contain any dangerous plastics, or be a non-reusable container.

Ending1: Not only will it contain dangerous chemicals, like arsenic, that can cause illness or even death, but your nose and mouth may be affected as well. [title] Add 1 l of saffron powder to the container. Ending2: It should also be high-ventilated so that it won't contain pet waste. [title] Mix together 2 tablespoons of cold water and 1 tablespoon of alcohol in a glass or small bowl. Ending3: You can find nasal washes in all sorts of kitchen supply stores. You could also use your hands, if they are clean. Ending4: Glass or bpa-free plastic are both good container materials to consider. Always remember to wash your hands before and after creating your nasal rinse.

Answer format: ending1/ending2/ending3/ending4