YOU SAID:

i popped the cap off of my bottle

INTO JAPANESE

私はボトルのキャップを外してしまいました

BACK INTO ENGLISH

I took off the cap of the bottle

INTO JAPANESE

ペットボトルのキャップを外した

BACK INTO ENGLISH

I took off the cap of the plastic bottle.

INTO JAPANESE

ペットボトルのキャップを外しました。

BACK INTO ENGLISH

I took off the cap of the plastic bottle.