Sippy cup recommendations?


So my baby is 6 and a half months and we were told to start giving him water through a sippy. Now I've tried two different ones already with no good luck. One is a nuk with a beginner spout, the other is one the munchkin 360 cup which we tried first. I'm at a loss here cause I'm spending left and right on cups and I just want to find one that works for him. So what would you guys recommend for a first time user with sippys?