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

### Instruction:
 Dana通常每天喝一瓶500毫升的苏打水。由于商店目前缺货，她买了一瓶2升的苏打水。如果Dana继续每天喝500毫升的苏打水，2升的苏打水可以持续多久？1升等于1,000毫升。


### Response:
 一瓶2升的苏打水含有2*1,000毫升 = <<2*1000=2000>>2,000毫升。
一瓶2升的苏打水可以持续2,000毫升/500毫升 = <<2000/500=4>>4天。