Home Remedies For Sinusitis. Garlic. Garlic is nature's antibiotic. It is a strong antibacterial and antifungal agent. So include garlic in your daily diet. It can be enough to kill the fungus and treat sinusitis. … will be of good use to you. Every kitchen has turmeric, and the compound curcumin found in turmeric has been found to be able to clear the sinus cavity. Turmeric has anti inflammatory properties too. This can fight the inflammation in the sinus cavity and treat sinusitis.