How much money do I need to travel the U.S for 3 weeks?

If I want to go East Coast/Midwest.
How much money would be recommended I should carry?
I’m considering couch surfing as in accommodation, but for everything else (travel state to state, food, accessories etc) how much USD I need to have?
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Comments
For 3 weeks…. wow. We had 800 USD for ONE week so I don’t know.
To be safe i would say between $100 to $150 per day.Some days you may spend that much and other days you will not but it all evens out in the end.
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