How much money should I have to stay in America for 3 months?

I will be staying with someone. Therefore, I do not need to pay for rent, travelling expenses etc. I will still offer to pay or reimburse by buying food, cleaning and all those things. But for immigration purposes and myself, how much should I have for three months. And no I will not take $10,000 as of tax purposes either.

How much money should I have to stay in America for 3 months?
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