Why will Monty only drink milk

Finally a break through! So last night I cleaned out his bowls and filled them with bottled water. After about an hour he had his first ever small drink of water. It may not have been much but it's something which he had not done in my home, ever haha.
This morning he will not drink again and is crying for his milk but I think that just may be a routine for him now. For now I'm going to give him a little milk in the morning and some bottled water on the afternoon and see how it goes. Thank you all so much for the help, it looks like i'm getting there.

As suggested I'm also trying to find out a little about his past as there's so much I need to know, the water/milk problem, not eating hard food, petfrified of feet, why he's so tiny, there's so many things haha.

Thank you all again, He may not be drinking as he should yet but we're finally on the right path I think. I can't believe it was something as simple as not liking my water, which makes me think what are they putting in it.

 

Well Monty is back on the milk haha, one lick of water was all he had and that's it. I'm starting to wonder who is training who. Just to be safe we've been to the vets today for blood tests so I've got to wait now and see if it's medical or if he is just, as Chris put it, a special snowflake

He has a few bowls around the house but 3 are metal and only one is ceramic. I'll try anything at the minute so thank you for the idea, I'll try him without using his metal bowls for the next couple days.

Well this is another area he is giving me a headache . When he first arrived he was scared of all dogs and wouldn't go near them. Now how-ever, any dog around his size or smaller he walks up to and starts chest bumping them backwards until I move him away. He isn't aggressive (barking or growling) it's more like...erm...bullying haha. He knows his limits though as he is still scared of bigger dogs.
I'd love him to do something like flyball as he is a massive bundle of energy, which if he doesn't burn off he gets into trouble. I'm certainly going to look into it, he's probably too small to win any races but it's the taking part that counts