What do rabbits eat?

Oat hay, oat hay, oat hay. Did I mention oat hay? Twenty-four hours a day. They should never run out. A bale would set you back about a 100ZARS. Click here for a list of suppliers.
Greens. Twice a day. See the image below. It is not comprehensive, so please Google before trying anything.
If you want to try something on the approved list for the first time, give them a tiny bit and see how their tummies react to it.
A few pellets as treats. A good way to check whether they are healthy and happy, is to offer them three of four of their favourite pellets during the day. If they do not want to eat, take them to the vet.