Certainly! Here's a simple recipe for a homemade glycerin nasal spray:

Ingredients:
- 1 cup distilled water
- 1 teaspoon glycerin
- 1/4 teaspoon salt (preferably non-iodized)
- Optional: 1-2 drops of essential oil (such as eucalyptus or tea tree oil) for added antimicrobial properties

Instructions:
1. Start by sterilizing the nasal spray bottle and its components. You can do this by washing them thoroughly with hot, soapy water and rinsing well. Alternatively, you can use a dishwasher or boil them for a few minutes.
2. In a clean container, combine the distilled water and glycerin. Glycerin acts as a humectant, helping to moisturize the nasal passages.
3. Add the salt to the mixture. Salt helps to create an isotonic solution, which is similar to the natural balance of the body's fluids.
4. If desired, add a few drops of essential oil for added antimicrobial properties. However, be cautious with the amount as essential oils can be irritating to some individuals.
5. Stir the mixture well until all the ingredients are fully dissolved.
6. Use a funnel to pour the solution into the sterilized nasal spray bottle.
7. Close the bottle tightly and label it with the date of preparation.
8. Store the nasal spray in the refrigerator to help prolong its shelf life and keep it cool for a soothing sensation when used.

Remember to always consult with a healthcare professional before using any homemade remedies, especially if you have any underlying medical conditions or sensitivities.