Budget setup:
1)A tripod,
2)If you want close up shots then an extension tube might come in cheap and handy.
3) Good light source (either during day time by the window) or a off camera flash.
4) Some kind of diffuser for your flash (Some use softboxes, cheaper would be umbrella, even cheaper would be to bounce light through large white cardboards). Alternative can consider getting a product shoot tent?
5) Good to have cable relase or just use timer to reduce camera shake.
6) Some "props" for your food? E.g. nice looking plates, bowls, etc.