I think this "get" generally means "to buy" and "good food" is "delisious food", isn't it? So, I would say: どこで美味しい食べ物を買うことができますか。 I hope this was helpful. If I understood wrong for my English, please let me know.

おいしい ごはん は どこ ですか。 Oishii gohan wa doko desuka. It's a very simple way of asking, but not weird or rude. :)