YOU SAID:

I shouldn't not be drinking at the shower

INTO JAPANESE

私はシャワーでない飲むべきではないです。

BACK INTO ENGLISH

I should not drink it is not a shower.

INTO JAPANESE

飲まない、シャワーではありません。

BACK INTO ENGLISH

I don't shower, don't drink.

INTO JAPANESE

私は飲まない、シャワーをしないでください。

BACK INTO ENGLISH

I don't shower, don't drink.