Does any Breastfeeding mommas have recommendations for a starter cup? I'm trying to transition him…

Does any Breastfeeding mommas have recommendations for a starter cup? I'm trying to transition him to be able to drink juice and water but he gets so frustrated sucking on it.. I even given him bottles since the nipple is shaped closely.. He rather's play with it than actually drink it lol so frustrating 😐😐😐