OH ordered a water bottle for Rodders, the type you attach to the crate with a valve that he has to learn to suck from. While he was out playing in the garden I attached it to the crate and called him in.
First I smeared dip (it was the first thing to hand) on my finger and he seemed to like it, I then smeared it around the valve and put him in there to lick it. Then we did it again and again. Not sure he has got the hang of it, but he likes dip!