What is a normal weekly grocery bill for one person?

I just did a calculation and my next party is supposed to cost around $65.00 but that is mainly because I plan on having enough left over food to last me 6 days afterwards, and I could save some money on delivery fees if I decided to buy the groceries myself instead of hiring a driver to buy them, but that would mean making 7 trips to the grocery store by walking because I cannot carry that many groceries in my two hands in one sitting.

What is a normal weekly grocery bill for one person?
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