Just taught him to point by imitation, then got him to point for his spoon of yoghurt before giving it. 'What do you want ds?', then got him to point for his water.
Then held up his water, and his spoon of yoghurt for him to choose. He chose yoghurt mostly but did choose the water.
Then, he giggled and pointed to the yoghurt pot. I felt I had to give it to him at that point. He's now covered head to toe in sticking white stuff.
Who knew babies could be so much fun. Not me.