"A quick puja has the same structure as acts ordinary people would perform for a quick reception, hospitality and affectionate interaction with a beloved guest. First the deity is greeted, acknowledged by name and welcomed, sometimes with a
diya (earthern lamp/candle) or lighted incense stick, (*). The devotee proceeds to connect with the spiritual manifestation by meditating (a form of
darshan), or chanting hymns and mantras, then personal prayers follow. After prayer is finished, (**) the spiritual visitor as guest is affectionately thanked and greeted goodbye. A quick meditative puja is sometimes offered by some Hindus without an idol or image. According to Fuller, Hindu texts allow flexibility and abbreviated puja according to occasion, needs and personal preferences."
Puja (Hinduism) - Wikipedia
* Aup adds; flowers, offering something sweet to be eaten later by the devotee as a blessing - prasada, pleasure of the deity
** Aup again: a mark on the forehead - Tilaka, with Red paste, Yellow sandal and saffron paste, ash from the puja lamp or 'Gopi Chandan', fine soil from some water bodies in India, according to the deity a person worships, the deities have their preferences
A bath and no non-vegetarian food before puja are generally considered appropriate.