Translation:Are you taking food for three or four days?
I can see this interpretation now that you mention it, but I think that it's still an unnatural phrase in English. I think that someone would be more likely to say "taking food with you" or "bringing food" or. "Take food" is a synonym for "eat", which makes it someone strange here.
That said, I could be overthinking it.
I am a native English speaker and this sentence makes no sense to me. What is "taking food"? Do we mean like eating, or do we mean like moving food from one place to another?
Also, "Are you" cannot be used with the present progressive when a period of time is defined. You can ask "Are you taking food?" but not "Are you taking food for three or four days?" The correct grammar would be "Have you been taking food for three or four days?"