My bun rarely licks his salt lick, but he doeslick it occasionally, because I can see the beginning of a littlegroove around the middle where it is thinner. I would leaveit in there for your bunny.
As far as the water bottle, if it were me, I would try to lower/raiseit a bit and see how he responds. I would also try a bowl with water -maybe he would be more comfortable drinking from a dish... But there isa chance that it is just boredom or agression or something. My bunlikes to rearrange things whenever I set his cage up for him.Maybe he just wants to move it.
But most importantly, check that the water flows when you press on themetal ball, and keep tabs on the water level and make sure he isdrinking. If he's not, I would say the crock of water might be hispreference.