What's Malcolm drinking?

Malcolm is getting bigger by the day and he is now more willing to sit in the highchair when we eatout. Oh, that's when i use the dont-leave-home-without-it item a.k.a, the nappy cloth. Ingenious eh. Ya, he's practically tied secured to the highchair. If not, he'll be all over the table.

See, he now wants to grab at everything within reach. And in this picture, Malcolm is trying to grab hubby's chopsticks. And no, he doesnt want to eat. He wants Papa to put the chopstick down so that he can get what Malcolm wants for him, lol. Smart, eh.

Ahhhhh..... shuih-fook-saiiii. So, any idea what Malcolm is drinking?