Mamasan is working tonight so it’s me tucking in the grandboy:

“Ummm gwumpa I’m thirsty.”

“OK. You are thirsty.” (See comment below)

“May I have some water, gwumpa? You get it for me? That would be great.”

I see a future of middle management ahead of this kid…

We’re in the process of acknowledging his needs but making him explicitly ask for assistance instead of hinting around. 
Clears up future misunderstandings and will probably help him get that raise or bonus when he’s out in the working world. 
If you don’t ask, you don’t get…!