Transfer and full bladder

Re

So I have my embryo transfer tomorrow. I'm aware that I need to have a full bladder for this. However, I have an acupuncture session before hand and then it takes an hour to drive to the hospital. I can't go this long! Do you think it would be ok instead to drink a litre of water on the journey to the hospital? Instead of not weeing all morning lol 😂 xxx