In fact, rabbits don't need water. Water can be obtained from vegetables. Is it because you are too delicate? It is an ordinary rabbit, isn't it?

Don't feed fruit cakes at ordinary times, but feed fresh vegetables such as green vegetables or seasonal vegetables with rabbit food.

It may also be diarrhea. Although my rabbit has been eating omnivorous food and has never had diarrhea, it seems that diarrhea is easy to die. Give him some medicine for diarrhea. Dilution with water should be possible. Hamster diarrhea has been cured before, or it can be used exclusively for pets.

Don't worry too much about the other rabbit. I'm sorry for your loss.