do you think that there is enough water or not?这个句子是正确的吗?

问题描述:

do you think that there is enough water or not?这个句子是正确的吗?

正确的应该是:
Do you think whether there is enough water or not?

不知道怎么说,英语不很好,但原句和楼上的都不对劲样子,特别是or not~