Apparently our Caleb knew what he wanted and even though Mummy forgot, he simply helped himself to the water during the walk home.
What surprised Mummy is that first he helped himself to his bottle and secondly, he actually could open the bottle to drink on his own!!
Mummy has to open the cap on the bottle with both hands coz it's quite tight and Mummy was wondering how in the world did the boy do it.
To find out, Mummy told Caleb that she would help him close the cap on the bottle. After closing it, Caleb said "no-no", held the bottle at the two handles and used his mouth to open the cap on the bottle and happily continued to drink. It's really amazing what this kid can do!
Here's a pix of his bottle when it's closed and when it's open.
Closed...

Open...
