Yes since coffee is less than 50 calories even with a bit of milk or creamer added to the cup of coffee then that makes coffee just fine for drinking while intermittent fasting.
As long as you drink things that remain under 50 calories your body will continue to remain in a fasted state.
Tea is also okay to drink when you're intermittent fasting.
If drinking water when intermittent fasting you can add a bit of salt to the glass of water you're drinking which will help replace the electrolytes in your body.