Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
In India, it cost $1 to purify a gallon of fresh water. Each person needs 1/2 a gallon of fresh water a day. In a family of 6, how much will it cost for fresh water for the day?

### Response:
A family of 6 needs 6/2 = <<6/2=3>>3 gallons a day.
It will cost 3 * $1 = $<<3*1=3>>3.
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