Sippy Cup?

Alantra🧜‍♀️ • Wife ❤ 1 son 💙 One on the way with a twin in heaven 💕

How do I help my son with a sippy? Or just let him make a mess with it until he learns? They want me to give it to him once a day with water, juice or formula in it. He just chews on it and lets it run out of his mouth and doesn't even try to swallow it.