Slurpin' on a Sippy Cup

We are desperately trying to get Weston to take a sippy cup...or maybe those aren't the right words. He will take the cup---but not necessarily drink from it. He LOVES to chew on the spout, the handles, and even the bottom of the cup. He loves to bang it around on the table or highchair. But if he accidentally sucks on it and gets juice or water out, it surprises him and he can't stand it. We don't know what else to do! We've tried room temperature, cold, and even warm water and juice. He simply doesn't want anything to do with it. We have one of every kind of cup possible in hopes that he just "hasn't found the one for him" yet, ha...I suppose we'll just keep giving it to him and hope he realizes there are good things in that cup one day!