Drinking water during 3 hour glucose test

I completely bombed my 1 hour test and when I went to take my 3 hour I asked my doctor if I could have water and she just said yes. She didn’t specify as to before or during or even how much. There is a lot of conflicting data out there concerning this. I ended up waking up in the morning and drinking a bottle of water (500ml) in the time frame of about an hour right up until I got to the lab then I drank nothing until after the test was over. Now I’m hearing that this could have diluted my results and I’m worried this could have made me “pass” when I shouldn’t have. I just want to hear other people’s experiences and thoughts.