"I drink water when I eat."
Translation:Saya minum air ketika saya makan.
My answer "Saya meminum air ketika saya memakan" was wrong.
Please report it , so that they can fix it.
It should be accepted as well.
However, please note that the "me- prefix" is usually dropped with these verbs "makan" & "minum", especially in informal & everyday speech.