The water issue, petland sells "ergonomic" ceramic water dishes that have a lip at the top inside for if they kick their water. Aswell as a dipped kind of neck for easy drinking. Would agree with other user to have more than one for more than one bunny. Poop that does not come out in pellet form or is soft could mean alot of things. With such a young bunny, he may be not eating enough hay. Also could be eating too many fruits and veggies? If you feed him any at all it should be low low amount per day. Keep in mind an adult rabbit can have UP TO a cup a day. But your little potatoe shouldn't have much at all. It may be too many treats, or it could even be the litter going through his body if that's not what hes used to. With such a small one there could be ALOT of reasons for poop that's soft. I would just watch his intake of certain things and how much of his litter hes eating for a couple days, and if he is functioning normally, doesnt seem to be draggy or I'll then you might be able to figure out where there is something too much or too little that he is getting to. But push the hay!!! LOTS OF HAY IS GOOD! no matter the size of the rabbit, hay regulates their systems.
Goodluck.