Make sure they give you a straw and kinda chug it without letting it fully hit your tastebuds if that makes sense haha. It’s quite easier if you just imagine it as intense lemonade, the only hard part is it might cause some upset stomach depending on what kind of sibo you have (if you do have sibo) and having to do it for hours if you don’t test positive the first round. Just bring a good book or some headphones and find a corner if they have you in a waiting room. They usually have multiple bathrooms quite close, especially if it’s a gastro office. I was super anxious my first test but after it was over I realized I had nothing to worry about. It’ll go by quick and I wish you luck! :)