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

### Instruction:
 彼得去商店买苏打水。苏打水每盎司价格为0.25美元。他带了2美元，离开时还剩下0.5美元。他买了多少盎司的苏打水？


### Response:
 他在苏打水上花了1.5美元，因为2 - 0.5 = 1.5
他买了6盎司的苏打水，因为1.5 / 0.25 = <<6=6>>6