Holding the bottle

My LO is 11 months tomorrow and we are still struggling to hold his own bottle/sippy cup. He will hold it if I’m holding him leaned back but he always lets go about a min in. Then if he’s sitting eating food he can’t figure out to tip the cup up. I try not to get frustrated but it’s not hard to. He’s 11 months and still not holding his cups. I don’t know what to do. I don’t know if he’s just lazy or what.