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.
2015年5月21日
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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. :)