Can you eat before your glucose test? If so, what should you eat?

I have my glucose test tomorrow at 10. I’m going into work at 5:15 and working half a day. The instructions my doctors office gave me were to come in before my next appointment but my next appointment is at 3 in the afternoon, they also told me to avoid lunch because it will mess things up. So I’m going in after my shift in the morning. They said I don’t need to fast but I should avoid things like fruit juices and cereal (sugary things). What can I eat because I’ll obviously be hungry and get nauseous before 10am. Any suggestions??