YOU SAID:

I'm going to be sad if I don't get coffee today.

INTO JAPANESE

今日はコーヒーを飲まないと悲しいです。

BACK INTO ENGLISH

I'm sad if I don't drink coffee today.

INTO JAPANESE

今日コーヒーを飲まなければ悲しいです。

BACK INTO ENGLISH

I'm sad if I don't drink coffee today.