I had better luck with bottles myself... I have not had leakage problems and they are easily cleaned with a baby bottle brush - with bowls the water was never clean enough in my opinion.
When you get your bunny, ask if he/she is used to a water bowl or bottle and if you are going to switch from one to another, have both filled with water at first so you can see what the bunny prefers... Bowl bunnies I have switched to the bottle when they came close to investigate it and a tiny squeeze can get the water flowing to get bunny's attention... if bunny is thirsty at that moment, he/she will get the idea through practice.
Just my humble opinion. What kind of bunny are you getting?
Denise