One fun game with a kid that age is to claim that their things are yours, or to suggest you. You point to their bottle and you ask in a hopeful voice: "Is that MY bottle?"
"That's MY bottle!" they respond pretty consistently.
It's important to do it in a friendly way. If they actually feel threatened, like you might take their stuff, you have to back off immediately and apologize.
The interesting thing, is that they like this game a lot. They seem to revel in the self-assertion of claiming something for their own. It's fun to watch.
I did it with her mommy too. I pointed at our friend, Reena, and said: "Is that my mommy?"
"My mommy!" With a big smile.
Rhyme of the day:
A proud owner is she,