What objects do Hindus use to worship?

a tilak(a paint on the forehead) made of sandalwood, holy water from a river like the Ganges or Yamuna etc, a conch(to make a nice echoing sound), bells made of brass(holding them in the hand and ringing it continually).

In some elaborate pujas( that's what prayers are called) we have a fire called Yagna, where you would put in many herbs, ghee( sumthin like butter amde from milk), camphor, honey