No animal can live without water, even rabbits. The water for rabbits must be clean boiled water.
Don't think that you always feed vegetables to rabbits, it's just your luck. If rabbits eat vegetables for a long time, vegetables will rot in the intestine and easily die of enteritis. It should be: 1-6 months old-appropriate alfalfa hay+unlimited ladder grass+young rabbit food+boiled water; More than 6 months-unlimited Timothy hay+adult rabbit food+boiled water+a small amount of vegetables and fruits (vegetables must be moisture-free), just give it a pinch of rabbit food. ?
Rabbits must drink water, even if they eat cabbage leaves every day. Just prepare a bowl filled with water. The rabbit can drink it himself, and he can control the quantity himself.