The common duiker has a wide diet; beyond browsing for leaves, flowers, fruits and tubers, they will also eat insects, frogs, small birds and mammals. As long as they have vegetation to eat they can go without drinking for very long periods. In the rainy season, they will frequently not drink water at all, instead obtaining fluids from fruits.
Sources:
(*) https://en.wikipedia.org/wiki/Common_duiker
(*) https://www.krugerpark.co.za/africa_common_duiker.html
(*) https://animalia.bio/common-duiker
By Farid AMADOU BAHLEMAN - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=114725119
Buck Bok
They are active both day and night, but become more nocturnal near human settlements. Males are territorial and smear gland secretions on rocks and branches to mark their territories; their preferred resting places are generally on elevated ground, where they can observe their territory.
Sources:
(*) https://en.wikipedia.org/wiki/Common_duiker
(*) https://www.krugerpark.co.za/africa_common_duiker.html
(*) https://animalia.bio/common-duiker