Hunt got his second in the 88th minute before Priskin pulled back an injury time consolation for the visitors.
Reading (4-4-2): Stack; Halls, De La Cruz, Osano, Mate; Bikey, Little, Oster, Hayes, Hunt, Long
Subs: McCarthy, Ujah, Davies, Church, Henry.
Watford (4-4-2): Lee; Mariappa, Kamara, DeMerit, Parkes; Spring, Bangura, Blizzard, McNamee; Bouazza, Priskin.
Subs: Gill, Diagouraga, Chambers, Seanla, Jarrett.