Best hacks to quickly stop a cough?

I woke up yesterday with a bad cough and have lost my voice. I need to quickly get rid of it in time for work tomorrow. I took a covid test which came back negative but I'm still coughing nonstop. My job is answering phonecalls and dealing with customer complaints/questions, and my workplace setup is very socially distanced so I am not putting anyone else at risk by going to work sick. I cannot afford to take a sick day but I can't be coughing into customers ears over the phone. Please help