How much water for 3D/4D?

Alright, guys, so the owner of the ultrasound place we’ll be going to on Thursday mentioned that I should drink plenty of water 3-5 days before the appointment. How much is plenty in your opinion? Lol 🤔 I typically drink two bottles of water in the morning, two in the afternoon after lunch and probably two at night or so. How much should I up my intake? I’m a teacher, so it’s tough to have a full bladder, but I want to provide the best “environment” to get those good photos 🤞🏻 thanks!