I think the secret consists in how much water you throw, the curve the water is thrown in and the force you throw the water with.

If you have a garden or a yard, you can practice a little with your son. Give him a glass of water and tell him to throw it a bit higher than his head, by swinging his hand back a little and not with much force. You definitely need to try out a few swings to see what is needed but it's a good game and practice for both of you.

At least you keep him busy and he's learning something too. It's a win-win.

By the time you go to Thailand 🇹🇭 again, you both know how to do it 😎