Glucose test questions.

Hi, Im a FTM and just wondering about the glucose test I have to have in a few days. Is there anything I should or shouldn't eat before it? I know the nurse said to try not to have alot of sugar but is there anything else? Also what flavor is the least disgusting? Im worried Ill have a hard time drinking the stuff or will get sick from it. Thank you all for taking the time to answer my questions! You ladies on this app are a life saver and my pregnancy wouldn't be the same without all of ur patience and support :)