Here’s a full list of commonly used essential puja samagri or pooja items for Durga Puja :

Idols or Pictures of Goddess Durga and her various forms (Devi, Lakshmi, Saraswati, Ganesha and Kartikeya)
Decorative items such as flower Garlands, Cloth and Jewellery for adorning the Idols/Pictures.
A Puja Thali.
Fresh Flowers such as Marigolds, Lotuses and Jasmine for offerings and decoration.
Durva grass.
Coconut.
Paan ke patte aur Supari (Betel leaves and Nuts)
Fruits such as bananas, apples and pomegranates for offering.
Sweets such as laddoo, peda and barfi for offering and Prasad (Blessed food)
Rice grains for offering.
Agarbatti (Incense Sticks)
Kapur (Camphor) and Dhoop (Aromatic smoke) for aarti and offering.
Chandan Paste (Sandalwood paste for applying on the Idols/Pictures and for offering)
Ghee (Clarified butter) for offering in the Diya (Oil Lamp) and for Abhishek (Ritual bath)
Milk and milk products such as curd, butter and cheese for Abhishek and Offerings.
Shahad (Honey)
Tulsi Leaves (Basil)
Kumkum (Vermilion) and Haldi Powder (Turmeric powder) for applying on the Idols/Pictures and for Offering.
Keasr (Saffron)
Shankha (Conch Shell)
Ghanti (A brass bell)
Red flowers such as hibiscus for offering.
Coconut oil for offering.
Supari (Betel Nuts)
Laung (Cloves)
Ilayachi (Cardamom)
Diya (Oil Lamp)
Kapur (Camphor)
Agarbatti (Incense Sticks)
Kalash (An earthen or metal pot) filled with Ganga Jal (Holy water) for invoking the goddess.
Panchamrit (A mixture of milk, yogurt, honey, ghee and sugar) for Abhishek and Offering.
Dhak (Traditional drum) for accompanying the Aarti and Rituals.
Chandan Paste (Sandalwood) or A Red cloth for wrapping around the Kalash.
Moli (Sacred Thread) for tying around the wrist of the devotees.
Gulal (Coloured Powder) for offering and decoration.
Bowls and Spoons for the offering of the Prasad.
Scriptures (Durga Saptashati or Chandi Path) for recitation and reading during the puja.